Applying a link in an image

Hello All!

I’ve been studying web development and stuck in this image interaction.
I need to know how to provide a link to an image without tag?
I tried with an tag. Image size is 50×50 and when I move the cursor over to the image I could see the link applied to the whole parallel horizontal line even if there was nothing.
Without tag I used window object but that didn’t work. So I need suggestions.