What is the main task of a B-tree and what is its advantage when working with large volumes of data?

The main task of a B-tree is efficient storage and fast search, insertion, and deletion of data in large volumes, especially on external storage devices (e.g., hard drives).

Advantages of B-trees when working with large data:

• High branching factor: each node contains many keys and child links, reducing the tree height and the number of disk read operations.
• Balancing: the tree is always balanced, guaranteeing logarithmic time for search, insert, and delete operations.
• Optimization for external memory: the structure minimizes disk access, which is critical for performance with large data volumes.

Therefore, B-trees are widely used in databases and file systems for efficient indexing and quick data access.