Uses
In pocket calculator-like programs (for example, Microsoft Calculator for Windows users), the enter key of the numeric keypad acts like the equal to (=) button to obtain the result of the previously entered operations.
Usually the default button on a form is highlighted, giving a subtle visual clue that the user has the option of clicking the button or simply pressing Enter.
In modern word processing applications, pressing the return key ends a paragraph and starts a new one. Spacing between the paragraphs can be defined through paragraph styles.
Before computers, when typewriters were used, the “Enter” key was kept comparatively large. This is due to the frequency of usage (which also includes the space bar), and therefore, is kept large to reduce the likelihood of finger slips.
Read more about this topic: Enter Key