What is the difference between Rebuild\Clean project\sync. android studio?

Question

Android

I can not understand what is the difference and what is hidden under each command. Couldn't find clear stuff on google. If there are good links, throw a look. senk in advance

Answer 1

Clean project - deletes temporary files of the previous build.
Rebuild - will build the project completely from scratch (similar to Clean and then Build).
For clarification - during the build, all sorts of intermediate files are created for each compilation unit. If since the previous build some unit has not changed (under the unit you can conditionally mean the class) - then temporary files from the last time will be used to speed up.