An alt tag, also known as an alt attribute or alt text, is a piece of descriptive text that is added to the HTML code of an image on a website. The purpose of the alt tag is to provide a textual description of the image, in case the image cannot be displayed or if a user is using a screen reader to access the content. Alt tags are also used by search engines to understand the content of the image and improve its ranking in search results. Alt tags should be descriptive and relevant to the image, using keywords where appropriate, and should not be used for spammy or irrelevant purposes.
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Google's core updates are algorithm updates that fundamentally change the sorting of search results, taking about two weeks to complete. While the recent core update had less impact compared to the previous one, affected pages are advised to review technical factors such as headlines, content accuracy, and timeliness. Wikis, dictionaries, and sites with print content like advertisements may experience ranking decreases, while sites with high-quality video content tend to have higher rankings.