Carbon capture and storage
Carbon capture and storage (CCS, or sometimes CCUS
Capture
Direct air capture (DAC)
Trying to take CO2 out of the air uses almost as much energy as you got when you burned the equivalent amount of fossil fuels in the first place. In other words, it's basically useless.
Point source capture
Capturing the emissions at the source - this is viable for coal power plants, natural gas power plants, and some factories. It's not viable for cars or smaller sources.
Storage
CO2 is pumped into rocks deep in the ground.[ELABORATION needed] Hopefully this is stable and won't cause earthquakes or explosions at some point in the future.[RESEARCH needed]
Utilization
The CO2 is sometimes "used" before being stored. In practice, the only usage is for mining more oil & gas.[ELABORATION needed]