A task chair is one that is suitable for medium to heavy use. This means that whether you're based in a home or work office environment, you can easily use the chair for a full 8 hour day without experiencing significant discomfort.
Most task chairs will swivel 360° and have a number of options for adjustment including gas lift, tilt and back angle.
In general a standard computer operator chair is generally only suitable for 5-8 hours of continuous use and may therefore not be suitable for extended periods sitting at a desk.
If you are likely to be using your chair frequently and often, then we would recommend a task chair or ergonomic office chair.
The chairs shown in the image are Orangebox mesh back task chairs