.bash_profile is executed for login shells, while
.bashrc is executed for interactive non-login shells.
When you login (type username and password) via console, either sitting at the machine, or remotely via ssh:
.bash_profile is executed to configure your shell before the initial command prompt.
.bash_profile to run commands that should run only once, such as customizing the
$PATH environment variable .
If you’ve already logged into your machine and open a new terminal then
.bashrc is executed where you can type in any command.
.bashrc is also run when you start a new bash instance by typing
bash in a terminal.
In other words, here you can put the commands that should run every time you launch a new shell in the
.bashrc file. This include your aliases and functions , custom prompts, history customizations , and so on.