Whta is the next term in this series. YEB , WFD , UHG , SKI , ?

The first letter of each term is two step back to cover the first letter of next term. so first letter is Q. The second letter of the startind term is respectively move forward to first , second , third , fourth , to find the coresponding letter of the subsequent term so the letter is  O. Third letter is moved two or three step ahead to find the corresponding letter of the given terms so the letter is L.

So the term is QOL