Flying ants?

Flying ants?

Observation - Flying ants? - Global. Description: There were swarms of these on a chalk grassland cliff top near Brighton. I have always called them flying ants: am I correct? Are they normal ground ants swarming? And why do they do this?

There were swarms of these on a chalk grassland cliff top near Brighton. I have always called them "flying ants": am I correct? Are they normal ground ants swarming? And why do they do this?