On the computer keyboard, there is a key marked with the letter "Enter", which is the line feed key of the computer. Usually, at the bottom of the main keyboard, the Enter key is located on the right side of the space bar. Press the "Enter" key on the keyboard to wrap the line. If you need to wrap a line in a text box or other input box, you can also click the input focus in the box with the mouse and press Enter to wrap a line.

In computer operation, you can use the combination shortcut key "Shift+Enter" to wrap lines in addition to the Enter key. In addition, in different operating systems and software, the line feed key may have different forms and usages. For example, in the Windows operating system, you need to use Shift+Enter to break a line when writing an email.

The function of the line feed key:

1. Text line break: When the line break key is pressed, the cursor will move to the head of the next line, allowing you to create a new paragraph or start a new line in the document.

2. Confirm the input: In most cases, pressing the line feed key is equivalent to confirming your own input. For example, in the login form, when you enter a user name and password, pressing the line feed key usually triggers the login operation.

3. Send a message: In email, instant messaging or chat applications, pressing the line feed key is usually used to send a message.

4. Move in the table: In spreadsheet applications, pressing the line feed key is usually used to enter text in a cell and then move to the next cell.