Inserting images into documents or web pages enhances visual appeal and helps convey information effectively. To insert an image, you typically use an "Insert" menu option in software like Microsoft Word or Google Docs. You can choose to upload an image from your computer or select one from an online source. In web development, images can be added using HTML code. The `<img>` tag is used, where you specify the image's source URL and alternative text for accessibility. Properly inserting images improves user experience and can make content more engaging and informative.