The HREF tag

<a href="YOUR URL">WHAT IT WILL SAY</a>
Will become:
WHAT IT WILL SAY
(WARNING: Do not click that link, it goes nowhere.)

The IMG tag

<img src="YOUR URL">
Will become:

(Of course this doesn't show anything because that is not a real image url.)
Here is an example,

Combining both tags

<a href="YOUR URL"><img src="YOUR URL"></a>
Will become:

(WARNING: Do not click that link, it goes nowhere.)
(Of course this doesn't show anything because that is not a real image url.)
Here is an example,