Databases
Databases are organized collections of data stored and accessed electronically, designed to efficiently manage, retrieve, and manipulate information. They serve as the backbone for most applications by providing persistent storage, ensuring data integrity, and supporting concurrent access. Common types include relational (SQL) and non-relational (NoSQL) databases, each optimized for different data structures and use cases.
Developers should learn about databases because they are essential for building data-driven applications, such as web apps, mobile apps, and enterprise systems, where storing user information, transactions, or logs is required. Understanding databases helps in choosing the right type (e.g., SQL for structured data with complex queries, NoSQL for scalability with unstructured data) and designing efficient data models to ensure performance and reliability.