WaH stands for work at home. It is popular for both contact centres and BPO as a way of increasing flexibility.
The trend increased dramatically during the Coronavirus pandemic.
It is well-suited to split shifts where staff can work during both the morning and afternoon peak periods with a long gap over the lunchtime period. This is often impractical if you have to drive to the office twice a day.
A number of call centres and BPOs employ hybrid working where staff spend three days WaH and two days in the office.