IndiGo pilot declares 'PAN PAN' before diverting flight to Mumbai. What is this emergency call?

Passengers on an IndiGo flight from Delhi to Goa faced a mid-air scare on July 16 after the pilot issued a 'PAN-PAN' call to Air Traffic Control as the aircraft's engine reportedly faced a technical glitch. The Airbus A320neo, reportedly carrying 191 people, then safely diverted to Mumbai. What is this emergency call? How is it different from Mayday?

IndiGo pilot declares 'PAN PAN' before diverting flight to Mumbai. What is this emergency call?
Passengers on an IndiGo flight from Delhi to Goa faced a mid-air scare on July 16 after the pilot issued a 'PAN-PAN' call to Air Traffic Control as the aircraft's engine reportedly faced a technical glitch. The Airbus A320neo, reportedly carrying 191 people, then safely diverted to Mumbai. What is this emergency call? How is it different from Mayday?