What is the difference between application server and web server?

Client-to-Server application?

• I have a client-side application built in JavaScript. I now need to create a user log-in/registration functionality into my app. How can this be done? Is there such a thing as taken an initially 'client-side' applicaion and incorporating use of server storage?...PHP/MYSQL? What is the difference between a web server AND a Database server? Will I need to communicate to the Database server in order to store data? User Tracking; What would the sequential process be, when tracking user activity on my website and storing the details in order to feed those details into their user profile as say...'Recent activities: Jon voted for YES' What are the limitations when it comes to storage?

• Answer:

  I would just use PHP to create the login, it would probably be more secure anyhow. PHP is a server-side programming language. A Web Server is one that hosts the actual website and a Database server is a remote server that hosts just the database. If your database is hosted on a remote server then you will need to communicate with that remote server. Your limitations depends on how much space you are paying for. If you have 500MB of space then you limitation is 500MB of storage which includes, but is not limited to, email accounts, ftp accounts, physical emails, images, code, cPanel, and databases.