Yes, images do play an important role when it comes to SEO.

When it comes to images, here are 4 key points you need to remember when you perform On Page SEO for your website.

Insert alt tags for all images – Setting alternative text or alt tags is an important part of adding images to your website and its SEO. The reason behind this is when a search engine comes across an image, the engine cannot visualize what the image is about and to overcome this, it has to rely on alternative text for assistance.

Insert target keyword into an alt tag – This is a continuation from the previous point. While filling out the alternative text for an image, make sure to incorporate your target keyword in it.

Rename image file with exact keyword – not as important as the previous point but still viable is the process of naming your image files and adding your targeted keyword in their names. There is an exception though, for example, if you use a lot of similar images and have a specific way of organizing them by name you can always skip this part.

Use hyphen instead of underscore when renaming image file names – This is a continuation from the previous point about renaming image file with target keyword. This is due to the fact that the use of hyphens is more viable than using underscores in your image file names. Why? That's because Google algorithm has been written to understand hyphens better.
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