Alt tags are a basic addition you can make to images on your website that will improve search. Search engines don't know what an image contains, so in order to help them along you can add an html alt tag around an image in order to give it a description.
To add an alt tag, you need access to the code on your web site. Alt tags go inside of the tag and are used to add a text description. This is helpful if the image doesn't load, and like I mentioned above, it helps search engines know a textual description of your image. Keep the description simple and make sure the content is relevant to the image.
Here is an example of an image without an alt tag. This is an example, html tags need to be bound by greater than and less than symbols in order to work.
And here is an example of an image with an alt tag. This is an example, html tags need to be bound by greater than and less than symbols in order to work.
img src="purpleFish.png" alt="purple fish marketing logo"
You can see that it's a simple addition to the code, but it can make all of the different in optimizing your website.
Without Alt Tag:
With Alt Tag:
As long as the image shows, you don't really see a difference, but behind the scenes you've just improved your website.