DVD not reading

Hi there anyone i have a big problem i think my my comp is able to read cd nto dvd can u explain why

Hi and Welcome!

perhaps you don’t have a DVD capable (these normally have a “DVD” logo in the front plate) drive installed?
My crystal ball is on strike at the moment, so please tell us, what drive is installed in your computer. We need to know the exact model name as shown in Windows device manager (or its equivalent on Linux or Mac).