The standard format that can be displayed within a web page is GIF (Graphics Interchange Format) or JPEG (Joint Photographic Expert Group) . The GIF  files are compressed to reduces the file size  and  are translated to binary code that can be sent over the Internet. JPEG compression is very effective for photographic images where the colors can vary spatially over short distance. JPEG offers dramatic compression in file size  .  Finally JPEG images do not have the ability to have transparency.

The <img> tag places an image in a document.

url specifies the image path.

The alt attribute is used to display a text when the image can not be displayed for any reason, it is a good practice to fill in the alt attribute so that users with non-graphical browsers can gain information.

The align attribute specifies image alignment, While the height and width attribute specifies the image dimensions in pixels. Borders attribute specifies the image borders thickness.

VSPACE and HSPACE are numeric values, representing the number of pixels that should be left free around the image. VSPACE covers vertical spacing and HSPACE the horizontal spacing.

Image as a Link

To make an image into a link simply replace the text with the  image tag between the link tags.

example