When you're creating a web page, a blog post or even a Facebook post, using relevant images is a great way to help people understand the point of your post better and faster.
Visuals are processed 60,000 times faster in the brain than text.
Visuals are especially good for Facebook and blog posts where people scan most often. But, don't forget to make sure your website pages have an image, as well.
Relevance is important. Is this post about tea or tea cups? No, but that'll be what you'll think of right away and I bet if you're ever looking for this post later, that's what you'll remember. Sometimes it can be hard when your creating websites about something that isn't a material product, but it will benefit you to find a way to create or find an image that's suitable. Take some photos yourself, try a free stock photo site or hire someone to create something for you for only 5 dollars!