This refers to a couple (friends, lovers, whatever) that know each other only via online correspondence (e-mail, IM chats, video rooms, etc).

Got the covid-19 vaccine

noun, An online relationship (hence the name). It's where two people try to go out only with AIM and e-mail. Either terribly romantic or terribly pathetic.

an online relationship, not unlike, but often longer lasting and deeper than a flirtationship

A one-sided relationship that takes place solely on the internet. The female in it is usually a nice girl that thinks it's just a friendship, and the male is usually a desperate, anti-social nerd that thinks he has a girlfriend that he's never met, and expects her not to associate with any other males on the internet or jealousy and anger will ensue. When the male finally expresses his feelings about this girl he's never met, she informs him that it would be awkward to meet in real life and that she actually already has a real boyfriend, and the nerd is crushed, his hopes of being e-laid are dashed.

It almost always ends with a lengthy session of cyberstalking from the male nerd.

A relationship with someone you've only ever talked with online.

An online only relationship with a person/business/group.