High Availability means eliminating the possibility of single point of failure. It could mean by having redundant hardware, nodes, networks or even a data center across different geographical locations. As a result, you would get a better data and services uptime.
High availability could start as simple as having your data in multiple pen drives so that you could still continue to perform your work if any of the pen drive fail or it could be as complex as having multiple servers on different geographical locations so that your application could work even if one of the node is down.
Do not be mistaken that high availability would provide perfect or 100% uptime, remember the Murphy Law.
High availability hosting for your website and email would mean having your application running in more than one node/server at any time. This is a complex setup and you would have to consult your hosting provider if they have this services.
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