1. Alternatively referred to as a return key, when referring to a keyboard, the enter key is used to send the cursor to the next line or execute a command or operation. It is common for most standard keyboards to have two enter or return keys: one above the right Shift key and another on the bottom right of the numeric keypad.
2. In general, enter or entering refers to when data is being placed into the computer. For example, when searching for something in a search engine like Google, you are entering a query or set of words to find more information.