title: Big picture of domain, mobile app website and server
body: <p>I am new to backend world, currently I am very confused with these concept relationships and really need some help here.
  So currently I already have an iOS app and backend server(using python, hosting at AWS) ready. Now I need to register a new domain name and build a basic website to explain and promote my app.
  Let's assume I am using goDaddy to register a domain name as "hello.com", now I have my basic website ready as well, I guess I need to upload html files to goDaddy hosting server then the website should be able to run, but then how can I link it to our python server? 
  For example, in the iOS code when I am sending a http request, I will need to send it to "<a href="https://hello.com/api/xxx" rel="nofollow">https://hello.com/api/xxx</a>", correct? Please correct me if I am wrong.</p>