They give search engines and users who cannot see the image a way to understand what the image shows. An alt tag is also called alt text and is an HTML attribute.
Alt tags are also called alt text and alt descriptions. They are particularly important because they provide a description of the image for visitors to the website who cannot see the image itself. This improves the user experience for everyone.
When it comes to SEO work, alt tags are important because they help the search engine's crawlers understand what is in the image. The more accurately you describe the image's content, the less is left to the crawlers' own interpretation. This can therefore have an impact on whether your text ranks for the right keywords, and whether you rank on Google at all.
As mentioned, it is about describing the image as accurately as possible and with the right keywords. Take a starting point in the keyword analysis you have used in connection with the rest of the content on the subpage or post the image is intended for. However, do not overdo the use of certain keywords, as this can have a negative impact on your SEO.
It should ideally be more precise than just the overall topic your image falls under. The topic is often already described in the headings, body text and content of the page the image is part of.
Be descriptive and use whole, meaningful sentences in your alt tags. If, for example, you want to describe an image of clothing from a webshop, you can advantageously mention the size and colour of the clothing in the alt tag.
