The main features of Memcached include :

* In-Memory Data Storage : Memcached stores data in memory, enabling lightning-fast read and write operations compared to disk-based storage systems.

* Distributed Caching : Memcached supports distributed caching across multiple servers, allowing for horizontal scalability and high availability.

* Simple Key-Value Store : Memcached provides a simple key-value data model, where data is stored and retrieved using unique keys.

* High Performance : Memcached is optimized for high performance and low-latency access, making it suitable for caching frequently accessed data in web applications.

* Cache Expiration : Memcached supports setting expiration times for cached data, allowing developers to control how long data remains in the cache before being evicted.
* Automatic Eviction : Memcached automatically evicts expired or least recently used data from the cache to reclaim memory space for new data.

* Client Libraries : Memcached provides client libraries for various programming languages, simplifying integration with client applications.

* Flexible Deployment Options : Memcached can be deployed on-premises or in the cloud, and it supports integration with popular web servers and frameworks.

* Protocol Support : Memcached supports a simple text-based protocol for communication between client applications and Memcached servers.

* Scalability : Memcached scales horizontally by adding or removing servers to handle increasing load and storage requirements.

* Open Source : Memcached is open-source software, allowing for community contributions, customization, and widespread adoption.