1.How to create a website in salesforce by developers.
suppose domain name 
2. I am giving the ceated domain name  to endusers they need not login with salesforce directly access that site 

is it possible in salesforce?
if possible is it free or paid for that domain maintanince and all other things.

Can u please Help i have developed a one android application it contains one textfield and in salesforce create a one object  and create one custom field as Student Name. I want to store the student name in salses force from my android app how ?