What is e-mail marketing? this is a serious question. As someone who has nothing to do with marketing, advertising and all that stuff for me "e-mail marketing" is just spam. or what is it? newsletters? Does it mean that you buy mail addresses from someone and send your stuff to them and see if someone opens it?
It's when people subscribe to your email lists and you send them marketing messages. For example, you might sign up to an email newsletter from a shop you go to, and they will send you emails with marketing messages (sales/new products etc.)