Change data capture (CDC) refers to the process of identifying and capturing changes made to data in a database and then delivering those changes in real-time to a downstream process or system. 

https://www.qlik.com/us/change-data-capture/cdc-change-data-capture#:~:text=Change%20data%20capture%20(CDC)%20refers,a%20downstream%20process%20or%20system.