Final answer:
The mouse pointer changes to a text cursor or other relevant icon, such as a crosshair when inserting something, to indicate a different mode of interaction in various programs and improve usability.
Step-by-step explanation:
When you are about to insert an object or text in most programs, the mouse pointer often changes to indicate that a different action will be taken compared to the usual pointer behavior. For example, when inserting text in a text editor, the pointer may turn into a vertical text cursor or I-beam, which signals that you can click to place text at that specific location. In graphic design programs, the mouse pointer might change to a crosshair or a different icon that represents the tool currently selected (e.g., a paintbrush or a hand symbol). These visual cues are designed to help users understand the current mode of interaction with the application and improve the usability of the software.