What are the main advantages and disadvantages of using hash tables for data storage?

Hash tables are data structures that provide fast access to elements by key.

Advantages:

• Fast access: average search, insert, delete time is O(1).
• Flexibility: keys can be of almost any type (with a proper hash function implementation).
• Ease of use: many languages provide built-in implementations (e.g., HashMap in Java).

Disadvantages:

• Collisions: when hash values match, additional handling is required, which can degrade performance.
• Memory: hash tables may use more memory due to storing hash values and collision resolution structures.
• Unordered: elements are not stored in sorted order.

Thus, hash tables are excellent for fast search and insert operations but are not suitable if ordered data access is important.