GIT is a distributed source code management system. It helps in versioning the code we write in day to day life. And yes GIT is not just for the programmers to store their thousands of lines of code and put them in the SCM repository.
GIT can be used by anyone and everyone. Its ease of use, minimal foot print and distributed storage helps many people who need versioning. For example, an author can write a book, using git, he can commit his changes for each chapter and if needed, he can rework on the previous versions. A civil engineer can make his blueprints and store in GIT so that he can work from several versions if at all any changes are to be done.
Due to the elegance, and ease of use the GIT is the most popular and powerful SCM available on the market as of today.