As a happy owner of a new MacBook Pro I am aware of the limitations of only having USB-C connectors. It is clear that this is the future since Apple are not the only company to make this transition. However a number of the scientific application I use regularly were supplied on DVD and I suspect others may be in a similar situation so I thought I'd mention this tip. Instead of investing in an adaptor if you have an older Mac you can use DVD or CD sharing. Open up system preferences and select "Sharing", click the checkbox for "DVD or CD Sharing".

If you now open a "Finder" window on the MacBook Pro you should find "Remote Disc in the side bar. You may need to change your preferences to display CCs, DVDs etc. (Finder:Preferences)

You can then use it as normal.