Android Activities have life cycles. Can you describe what these are and the functions they perform?

"Activities occur within the Android application and have limited life cycles. The Activity class provides a number of callbacks to know that the system state has changed. This includes: creating, starting, resuming, pausing, stopping, destroying, and restarting. The syntax used for these commands begins with 'On,' followed by the command, and then the parameters of the activity. Each command executes a function similar to its name. For example, OnPause is used when an activity is moved to the background but is still running."