Image tag optimization, also known as image SEO, is a crucial practice in digital marketing and web development. It involves enhancing the visibility and search engine ranking of images on a website. By adding descriptive and relevant alt text, title attributes, and captions to images, you provide search engines with context about the image's content, which can improve its chances of appearing in search results. Proper image tag optimization not only enhances accessibility for visually impaired users but also contributes to better SEO, leading to increased organic traffic and better user experiences on your website. It's an essential part of on-page SEO.