Net neutrality is the concept that internet service providers (ISPs) should enable access to all content, applications and platforms without discrimination or prioritisation of any particular data packets.
In the US, the concept is under threat as the Federal Communications Commission (FCC) voted in December 2017 to repeal net neutrality rules, giving ISPs freedom to block or throttle content unless stopped by Congress or the courts.
Critics of the move argue that ending net neutrality will harm innovation, free speech and opinion, as well as create a two-tier internet; where those who can pay for faster access to their content gain an advantage over those who cannot.
In response, 21 state attorneys general and consumer groups sued the FCC in January 2018 to block the new rules and restore the old ones.