<img> tag defines an image in an html page.
<img> tag has two required attributes: src and alt.
Images are not technically inserted into an html page, but images are linked to html pages.
The <img> tag creates a holding space for the referenced image.
To link an image to another document, simply nest the <img> tag inside <a> tags.
Eg:
<img src="smileyface.png" alt="Smiley Face" height="48" width="48">
Attributes:
Attribute Value Description
src url Specifies the url of an image
alt text Specifies an alternate text for an image
height pixels Specifies the height of an image
width pixels Specifies the width of an image
usemap #mapname Specifies an image as a client-side image-map
ismap ismap Specifies an image as a server-side image-map
For more information, see here.