What is Salt Typhoon, Chinese group that tried to hack Trump's phone?

Phones used by US presidential candidate Donald Trump and his running mate JD Vance were targeted by Chinese government-backed hackers called 'Salt Typhoon'. The espionage group is mainly focused on counterintelligence targets, as opposed to other groups involved in corporate data theft or financial fraud. 'Typhoon' is used to denote Chinese hackers, while 'Salt' denotes the type of hacking.