ADA Compliance is not exactly new, but there is a noticeable increase in lawsuits. but the most important thing you can do to be ADA compliant is to make your website accessible to people with sensory disabilities like deafness or blindness. This includes alternate text for images and media that are more than decoration, like infographics and photos of things that explain or pertain to website content. This is most important if your website represents a public physical location, like a hotel or store of some kind. Because these lawsuits are usually pursued in the necessity, where people with disabilities really need access to such a business and can't obtain it. https://www.ada.gov/
The words in the tag should be more than a description. They should provide a text equivalent of the image. In other words, the tag should include the same meaningful information that other users obtain by looking at the image. In the example of the mayor’s picture, adding an “alt” tag with the words “Photograph of Mayor Jane Smith” provides a meaningful description.