In computer science, a branch is a way of organizing your computer code so it can be kept separate from other pieces of code you have written. Imagine it like a tree. Each branch on the tree is like a different part of the code. This way, you can change one part of the code without affecting the rest of the code. A branch is also like a different version of the code. So, if you make a change to one version of the code and need to go back to the original version, you can switch to another branch.