Cscope allows more powerful examination of C code than c-tags. Vim has builtin support for using the cscope utility as a tags source.
This tag is for questions about Vim's cscope integration features.
Cscope itself allows a user to query information such as a list of callers to a function or list of files that include another file.
The Vim integration allows these queries to be added to the tag stack or quickfix list for enhanced browsing of source code.
More information about cscope in vim can be found via