Search engines look for descriptive words throughout your site. They place emphasis on words in certain areas. One of the most important are "alt" tags for your images.
An "alt" tag is simply an alternative text message, that you would display should the image not be required – for example in a text based browser or on a mobile phone. Within this alt tag, you can add key words and phrases that you are keen to focus on.
For example, if I sell flowers and use this image:

My alt tag could be:
"Picture of a bunch of daffodils"
Or, it could be:
"Buy bunch of fresh daffodils, delivered free in Surrey"
Which do you think is more helpful? Which do you think will impact your SEO the best?
Ben




