CD or DVD?
Most laptops now come with a multi-function audio CD-player, CD-ROM drive, CD rewriter, DVD, and DVD rewriter—so you don't have to worry too much about this. (You can always add an external USB CD or DVD drive if you need to do.) The appearance of Blu-ray drives adds a new complication, but don't worry about them too much unless you're a games player. Most of us can cope with a standard CD/DVD reader and rewriter, which will come with most new desktops and laptops. Compact discs and DVDs are going to be around for a while yet.