How to indicate a text field does not contain content?

1. What is a text input field?
2. What is text field example?

What is a text input field?

A text field is a rectangular area in which people enter or edit small, specific pieces of text.

What is text field example?

A text field is a basic text control that enables the user to type a small amount of text. When the user indicates that text entry is complete (usually by pressing Enter), the text field fires an action event. If you need to obtain more than one line of input from the user, use a text area.