its the format for webpages u have "tags" that contain stuff. the tags tell the browser what to display and how to display it so like <b> ewis </b> would make the "ewis" text display as bold <img src="ewis.png"/> would display the ewis.png image stuff like that

modern websites do a bunch of complex stuff on top of this, but in the end it all resolves down to a bunch of html

you can see an example here: elfboy.quest just do ctrl + U and it will display the HTML

not a bottom

this elf boy is NOT a cocksleeve