There are four main reasons why image title tags is important: user experience, accessibility, contextual understanding, and relevance.

Title tags provide additional information about an image when users hover their cursor over it. This can enhance the user experience by offering context or details about the image, making the website more informative and engaging.

While the alt attribute is crucial for accessibility purposes (helping visually impaired users understand the content of an image through screen readers), the title attribute can offer supplementary information for all users, including those who might not see the image but hover over it.

Search engines use various signals to understand the content of an image. Title tags provide search engines with additional context about the image content, aiding them in comprehending the image better. This understanding can contribute to better indexing and potentially improved rankings in relevant searches, including image search.

When used appropriately and naturally, title tags can include relevant keywords related to the image content. This can strengthen the relevance of the image and the webpage it's on for those particular keywords, potentially impacting the page's SEO performance and rankings.