search command for packages in Ubuntu terminal to search updates and patches of the package specifically – askubuntu.com

search command for packages in Ubuntu terminal to search updates and
patches of the package specifically – askubuntu.com

Can I know what is the command to search any package using the terminal,
if I only know the name of the Software like, if I want to search VLC or
JDK,JRE.. etc If I do not know what is the url where …