Web sites are powered by databases, and those databases need to be hosted somewhere online near the web servers. Here's some links to help you get started with not just SQL Server hosting, but Access database hosting as well. When you outgrow Access, you can stay here at SQLServerPedia to learn how to upgrade your databases to SQL Server.
SQL Server Database Hosting for Training
Transactions are one of the things that keep your data safe, but they're not necessarily easy to understand. Here's some help:
Accessing Free Online Database Hosting
When your database file lives on a server on the internet, it can be frustrating to try to query data directly. If you copy the MDB file to your local hard drive, you can query the data with Microsoft SQL Server Management Studio:
When You Outgrow Access Database Hosting
SQLServerPedia Blog Entries About Access and Database Hosting
These blog entries point out short tips or helpful resources on other web sites: