What does the || : in this line of bash script from an rpm spec file do?

Question

ln -s /var/log/$SERVICE_NAME $RPM_INSTALL_PREFIX/logs || :

In the rpm spec file every line ends with || :

What is the significance of the || : and why is it there?

Answer 1

It causes any error to be ignored so that the rpm operation isn't canceled.

|| causes the next command to run if the previous command failed, and : always succeeds.