The terraform console command allows users to experiment with Terraform functions and expressions in a quick and easy manner. It supports built-in functions for computing values within a configuration, such as references to data exported by resources, arithmetic, conditional evaluation, and more. The console can be used to test functions and expressions before modifying configuration files, and it also interacts with any values held in the local or remote state if a state file is available. To exit the console, users can hit Ctrl-C or Ctrl-D, or type "exit."