How to show package dependency on Ubuntu

When you install a program or software package on ubuntu, it's hard to tell what are the package dependencies for that particular software, you never know until you run 'apt-get install' command, so is there a way to show package dependency before installing it?

How to search software package on Ubuntu

You can install software package on ubuntu using 'apt-get install' command, and you can uninstall software using 'apt-get remove' command, but what about searching the software package itself?