**Definition:**
An HTML image is a visual element displayed on a webpage using the `<img>` tag. It allows web developers to include pictures and graphics to enhance the content and design of a site.

**Key ideas:**
- The `<img>` tag requires a `src` attribute to specify the image source.
- The `alt` attribute provides alternative text for accessibility and SEO.
- Images can be in various formats, such as JPEG, PNG, and GIF.
- Proper image use improves user experience and engagement on websites.

**Why this topic matters in this category:**
Understanding HTML images is essential for creating visually appealing and accessible web pages in computer science.