Does "6X Slot Load Bluray (BD) Combo Drive (BD Read Only) " also read and write dvds + cds?

Im buying a laptop from dell and i saw the optical drive option which is "6X Slot Load Bluray (BD) Combo Drive (BD Read Only) ". so does it only read blue rays or it also reads cds and dvds and also writes on cds and dvds. im a comp noob =/