What is the use of alt tag ?

alt tag is used to provide a description of an image file. Search engines use the information from this tag to determine the best image to return for a search query.
 
Alt tag is used to find the image while browser doesn't loaded.
 
Alt tag is a factor in SEO. Yr Alt tag have to contain the focused key work that you want to SEO. Normally, Alt tag plays an important role with some field, fashion for examples.
 
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The alt attribute is used in HTML and XHTML documents to specify alternative text (alt text) that is to be rendered when the element to which it is applied cannot be rendered. It is also 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.
 
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