How does Git deal with binary files?

Question

• Do I have to do something to tell Git whether some files are binary (like in Subversion)? Or, can Git handle binary data automatically?
• If I change the binary

Answer 1

1. Git can usually detect binary files automatically.
2. No, Git will attempt to store delta-based changesets if it's less expensive to (not always the case).
3. Submodules are used if you want to reference other Git repositories within your project.