What does it mean to check-in Code

Question

I am new to the DevOps world and I am reading about Continuous Integration, What does it mean to check-in your source code. Does this mean pushing it to the branch after you write the code?

Answer 1

Checking-in code means to upload code to main branch repository so that its administrator can review the code and finally update the project version. Additionally, checking-out code is the opposite which means to download a copy of code from the repository. For example, on GitHub, cloning means checking-out code and pull request means checking-in code.