VMware Tools is the software that provides drivers for the virtual hardware underneath your virtual machine. It is also required for Guest Customization and certain snapshot features, but we highly recommend that you install it on all virtual machines.
VMware Tools can be installed by right clicking on your virtual machine and choosing “Install VMware Tools” from the context menu. On Windows machines, the installer should automatically launch from the CD-ROM drive and can be installed using the wizard.
On Linux & BSD machines, the CD-ROM will fist need to be mounted to the file system, and the installer then extracted from a compressed .tar.gz file inside the mount point. For a more thorough walkthrough of theinstallation on Linux systems, vist VMware's link.