A text box is a rectangular area on a computer screen or webpage where users can input or display text. It is commonly used in forms, applications, and websites to collect information such as names, addresses, or comments. Text boxes can vary in size and may allow for single-line or multi-line text entry. Text boxes are often accompanied by labels that indicate what information should be entered. They can also include features like placeholder text, which provides a hint about the expected input. In programming, text boxes are created using languages like HTML and can be styled with CSS for better visual appeal.