.bashrc file

It will be present in your home folder.

The rc extention is used to fire a set of run commands, to customize the environment.  For the .bashrc, it will usually hold the shell functions and aliases, distinct from the shell .profile.  You will likely notice other rc scripts for the vim editor, etc.

Since this file name starts with the "." (dot or period) character, it is considered a hidden file by Linux, so it is not displayed when you do a "normal" list of files in a directory, like "ls -l" or "ls -ltr".  You need to include the "a" option, something like: "ls -la" to see this file listed.

yes