2016 was a tremendous year for web-based services & software, including e-commerce and web-creation platforms. This is overall good for us, the consumers, as competition between these providers ensures a better product, lower price points and more versatility in the long run. Be sure to stick with known brands which offer low monthly payments and even free plans.
A domain name is the bit of the URL (the long address in your browser’s search bar) that identifies a web page — in this case your website. You can register them separately at sites like GoDaddy and Namecheap, but website builders offer to do it for you when you sign up with them. Most provide it for free (at least initially), while a handful charge a few extra bucks.