In web applications, there are several options available for database design and management. The most commonly used ones are relational databases, NoSQL databases, and cloud-based database services. Relational databases like MySQL, PostgreSQL, and Oracle use structured data and are suitable for applications with complex relationships between data entities. NoSQL databases like MongoDB, CouchDB, and Cassandra offer flexible and scalable storage for unstructured or semi-structured data. Cloud-based database services like Amazon RDS, Google Cloud SQL, and Azure SQL Database provide managed database solutions, offering high availability, scalability, and reduced maintenance overhead. The choice of database depends on factors such as data structure, scalability needs, performance requirements, and budget.