Alternative descriptions were created for people with visual impairment, they provide an image description. Alt attributes are so important for non-sighted users that it’s worth taking the time to learn how to write them properly, by using the correct markup and making sure they are useful. The alt attribute (note “attribute” instead of “label”) includes replacement instructions, which are required for images and image hotspots. Google gives positive ratings to websites that cover a subject to the fullest extent. Alt attributes, commonly referred to as alt text, are an essential element for an effective online presence. The alt attribute is used by "screen reader" software so that a person who is listening to the content of a webpage (for instance, a person who is blind) can interact with this element. In a recent tweet, Google’s John Muller said that “Pages can rank in web search for content found in image alt-attributes”. Its uses are many: Visually impaired people have audio readers that use the alt attribute; Definition: An alt tag, also known as "alt attribute" and "alt description," is an HTML attribute applied to image tags to provide a text alternative for search engines.Applying images to alt tags such as product photos can positively impact an ecommerce store's search engine rankings.. What purpose do alt tags serve? Though it might seem natural to assume that alternate text is a label or a description, it is not! It serves the users mentioned above with enriched website usability and also returns images in relevant search results due to enhanced site SEO. Alt text helps a webpage rank in Web Search Results. The alt attribute The alt attribute is an internet veteran, introduced in HTML 2 in 1995. Search engines ’ ability to recognize the contents of images is still limited which is why they rely on the alternative description in order to determine what the image contains. Code & tutorials: http://learn-the-web.algonquindesign.ca/topics/using-images/ An alt attribute is an accompanying command associated with certain HTML and XHTML tags designed to provide a way to associate alternative text with said tags. It’s also important because it holds information for screen readers as well as for bots (SEO, you know? The ALT attribute’s real purpose is to provide a description of the image for people who, for some reason or another, can’t see the image. Its most well-known use is as an alternative descriptor for img tags, but it can also be used in a similar manner with the area and input (if the input type is an image) tags. The ALT attribute’s real purpose is to provide a description of the image for people who, for some reason or another, can’t actually see the image. You can't blame young developers for not knowing this or any other accessibility related topic -- accessibility (and usability for that matter) aren't topics taught at most universities. 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