Type 1:
Particular tags will be blacklisted
<script> , <iframe> etc

Type 2:
Only a particular HTML tags will be allowed
<font> <img> <i> <a href>

Type 3:
Special Charecter will be blocked
> < will be blocked

Type 4:
Special charecters will be escaped and other wprds will be stored
Ex:<script>test</script> will be displayed as "test" or "scripttestscript"

Type 5:
HTML tags will be encoded and displayed in encoded format in the UI

Type 6:
All html tags will be rendered in plain text on the UI