The alt attribute is the HTML attribute used in HTML and XHTML documents to specify alternative text (alt text) that is to be rendered when the element

The alt attribute is the HTML attribute used in HTML and XHTML documents to specify alternative text that is to be rendered when the element to which it is applied cannot be rendered.

Alt text (alternative text) is a word or phrase that can be inserted as an attribute in an HTML (Hypertext Markup Language) document to tell Web site viewers the nature or contents of an image. The alt text appears in a blank box that would normally contain the image.

Alt text (alternative text) is a word or phrase that can be inserted as an attribute in an HTML (Hypertext Markup Language) document to tell Web site viewers the nature or contents of an image. The alt text appears in a blank box that would normally contain the image.

It is a word or phrase that can be inserted as an attribute in an HTML document to tell Web site viewers the nature or contents of an image. The alt text appears in a blank box that would normally contain the image.

Alt text -alternative text.
It is a word or phrase that can be inserted as an attribute in an HTML document to tell Web site viewers the nature or contents of an image. The alt text appears in a blank box that would normally contain the image

The alt tag is used by screen readers, Each image should have an alt text. Not just for SEO purposes but also because blind and visually impaired people otherwise won’t know what the image is for.

for crawling of images defining alt tag is important it may be some text or your keyword

The term “alt tag” is a commonly used abbreviation of what’s actually an alt attribute on an img tag. For any image on your site, the alt tag should describe what’s on it.

Alt tag is very important to define the image which help search engine to read the image.

It is a word or phrase that can be inserted as an attribute in an HTML document to tell Web site viewers the nature or contents of an image. The alt text appears in a blank box that would normally contain the image.

The alt attribute is the HTML attribute used in HTML and XHTML documents to specify alternative text that is to be rendered when the element to which it is applied cannot be rendered.

Search engine optimization is the process of affecting the visibility of a website or a web page in a web search engine's unpaid results—often referred to as "natural", "organic", or "earned" results.

Can you do a favor ? Please search this question on Google.

Alt text (alternative text) is a word or phrase that can be inserted as an attribute in an HTML (Hypertext Markup Language) document to tell Web site viewers the nature or contents of an image. The alt text appears in a blank box that would normally contain the image.