There is more than just two letters difference. In fact, you can not really compare them at all. But you can use them together.

156: URLs, URNs, URCs, Data URIs, and URIs.

Take Up Code is a podcast that explains computer programming topics through fun and engaging examples that you can relate to. The guided format allows you to gain valuable understanding of topics that will reinforce your studies, allow you to train new skills that you can apply on your job, and change your thinking about what it takes to become a professional programmer. The episodes are as short as possible so you can squeeze them into your daily routine.