First, according to Wikipedia, 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.
Before uploading images to a website, especially ones you have no control over, such as a social media platform, be mindful of the file name.
This is important because if a website doesn't let you write an alt attribute for your picture, your file name could do the same work by making a keyword recognizable. The alt attribute is the text that appears in the place of an image if the image is broken, or if a visually impaired person has settings to have alt attributes read out loud.
A social networking site may automatically fill in the alt attribute with your file name. Even if you cannot access alt attributes from a site that allows you to upload an image, it may automatically write them for you. Usually a website system will create it directly from the file name of your image.
For example: if you have an image called "logo-587.jpg", that doesn't say anything about your company name. But, if your filename was called "logo-your-company-name.jpg", that has more of a chance of coming up in a Google Image Search result.
This is a minor action you can take to affect your SEO, but it can have a great impact.
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