The address that someone types in their web browser to find you is called a domain name. Having your EXACT name is a good thing and if it is already taken, we can talk about options. The first rule of websites is to “keep it simple”.
I always look at the website address in all lower case letters as well to insure that there are no “hidden surprises”. Sometimes there are more words than intended and depending upon where people put the spaces, they can read differently!
Domain names are NOT case sensitive. So in other words http://mabelsdeliciouscakes.com is the same as http://MabelsDeliciousCakes.com and MabelsDeliciousCakes.com if typed into a browser. So it is easier to read and remember MabelsDeliciousCakes.com or even www.MabelsDeliciousCakes.com.
What comes after the name is an entirely different story. They are very different and can lead to a disaster. So if you had a page on your web site that was www.MabelsDeliciousCakes.com/Recipe and you sent it to someone as www.MabelsDeliciousCakes.com/recipe it would NOT work. Make sure that you pay very close attention to this. As a matter of fact, you may be better off copying the address from the window at the top of your browser for extra insurance.
Imagine your disappointment if you posted an address to an important event on FaceBook only to find out later that everyone got an error message when they tried to visit the page. Whoops, there goes some respect and profits down the tubes!
Always test an address before you send it or print it. And double check your work. A few extra seconds on your part can save a lot of time and frustration at the other end!