A README file is a text document that explains what a software project does and how to use it

When you download code from a website like GitHub or receive a folder of files from a colleague, a README is usually the first thing you should read. It sits in the main folder and answers the most basic questions: What is this project? What does it do? How do I get it running on my computer?

The name itself is the instruction — "read me" — and it's a convention that has existed in software development for decades. A README is plain text or formatted text (usually written in a format called Markdown), not a compiled program or a hidden system file. You can open it in any text editor.

README files are not required by any software, but they are expected. A project without one signals that the creator did not think about the people who would use it. A good README saves you hours of guessing.

Key Takeaways

  • A README file is a text document in the main project folder that explains what the software does and how to install or run it.
  • You open a README in any text editor or web browser — it is not a program itself, just information.
  • Most READMEs include the project name, a description, installation steps, usage examples, and information about the creator or license.
  • On GitHub and similar sites, the README displays automatically when you visit a project page, so you see it before downloading anything.
  • A missing or empty README usually means the project is incomplete or abandoned, which is useful information before you invest time in it.

Where you find a README and how it appears

When you download a project folder, the README sits at the top level — the same folder that holds all the actual code files. On your computer, it will be named something like README.txt, README.md, or just README with no extension.

If you are browsing code on GitHub, GitLab, or similar platforms, the README displays automatically on the project page below the file list. You do not have to download anything to read it — the website renders it as formatted text with headings, bold text, links, and lists. This is why many developers spend time making their README look good; it is the first impression a potential user gets.

The .md extension stands for Markdown, a simple formatting language that lets you write headings, bold text, and lists using plain text symbols. A file named README.md will display with formatting on GitHub but will still be readable as plain text if you open it in Notepad.

What information a README typically contains

A minimal README answers these questions: What is this? How do I install it? How do I use it? A more complete one adds examples, troubleshooting, and information about contributing or reporting bugs.

The project name and a one-sentence description usually come first. Then a longer explanation of what the project does and why someone might want it. Next comes installation instructions — the exact steps to get the software running on your computer, including any prerequisites like programming languages or other software you need first.

Usage examples show how to actually run the project or use its features. If it is a programming library, this section includes code snippets. If it is a tool, it shows the commands you would type. A troubleshooting section addresses common problems. At the bottom, many READMEs list the creator's name, a link to their website, and the license — the legal terms for how you can use the code.

Why README files matter for different types of projects

For open-source projects on GitHub, a README is essential. Thousands of people might find your project through search, and the README is your only chance to explain whether it solves their problem. A clear README means more people will use your code. A missing one means most people will move on.

For work projects shared between team members, a README saves time during onboarding. A new developer can read it and understand the project's purpose, how to set it up locally, and where to find documentation — without asking questions. This is especially valuable when the original creator is no longer available.

For personal projects or scripts you share with friends, a README prevents confusion. You might remember how your backup script works, but six months later you will not. A README written for someone who has never seen the code before is a gift to your future self.

How to read a README when you encounter one

Start with the project name and description at the top. This tells you immediately whether the project is relevant to what you are trying to do. If it is, read the installation section next — this is where you learn whether you have the prerequisites and how much work setup will be.

Then look at the usage examples. These show you what the project actually does in practice. If the examples do not match what you need, you have saved yourself time before downloading anything. If they do match, follow the installation steps exactly as written, in order. Do not skip steps or assume you already have something installed.

If you run into a problem, check the troubleshooting section before searching online. Many common issues are documented there. If your problem is not listed, the README usually includes contact information or a link to report bugs.

The difference between a README and other documentation

A README is not the same as a manual or full documentation. It is the entry point — the thing that gets you started. A manual might explain every feature in detail; a README explains the basics and points you toward the manual if you need more.

Some projects have a README plus a separate INSTALL.txt file with detailed setup instructions, or a CONTRIBUTING.md file that explains how to report bugs or submit improvements. These are supplementary. The README is the first document, the one that decides whether someone reads the others.

For very large projects, the README might be short and link to a full documentation website. This is fine — the README's job is to get you oriented and point you in the right direction, not to contain everything.

What a missing or poor README tells you

If a project has no README, it usually means one of three things: the project is very new and not yet ready for others to use, the creator did not think about users outside their own team, or the project is abandoned. None of these are good signs if you are considering using the code.

A README that is outdated or incomplete is also a warning. If the installation instructions do not match the current version, or if the usage examples do not work, the project may not be actively maintained. This matters because if you run into a bug, there may be no one to help you fix it.

A well-written README, by contrast, signals that the creator cares about their work and thinks about the people who use it. It is one of the best indicators that a project is worth your time.

Frequently Asked Questions

Can I edit a README file?

Yes. A README is just a text file. You can open it in any text editor (Notepad, Word, VS Code) and change it. If you are working on a shared project, you might commit your changes back to the repository so others see the updated information. For personal projects, you can edit it whenever you want to add new information.

What if a README is in a language I don't understand?

Many open-source projects have READMEs in English because that is the common language in software development. If you find one in another language, you can copy the text into a translation tool like Google Translate. Some larger projects provide READMEs in multiple languages, usually linked from the main one.

Do I need to create a README for my own projects?

If you are sharing code with others — whether on GitHub, in a work folder, or with friends — a README is helpful. Even a short one (project name, what it does, how to run it) is better than nothing. If the code is only for you and you never share it, a README is optional but still useful for your future self.

Is a README the same as a license file?

No. A license file (often named LICENSE or LICENSE.txt) states the legal terms for using the code — whether it is free, whether you can modify it, whether you must credit the creator. A README explains what the project does and how to use it. A project can have both, and many do.

Why is it called README and not INSTRUCTIONS or GUIDE?

The name is a convention from early Unix systems in the 1970s and 1980s. Developers would name important files in all caps so they stood out in a directory listing. "README" was the obvious choice for "read this first." The name stuck, and now it is the standard across all programming communities.