The document discusses various strategies for achieving high availability of web applications and databases. It covers evaluating business requirements, DNS configuration, using cloud infrastructure or owning hardware, basic setups with application and database servers, database replication and clustering options, load balancing tools for Linux and cloud environments, auto scaling features, and monitoring. The key strategies presented include replicating databases, load balancing web traffic, auto-scaling cloud resources, and configuring failover between redundant application and database servers.