ELK: Elasticsearch, Logstash, and Kibana.

• Elasticsearch is a search and analytics engine.
• Logstash is a server‑side data processing pipeline that ingests data from multiple sources simultaneously, transforms it, and then sends it to a “stash” like Elasticsearch.
• Kibana lets users visualize data with charts and graphs in Elasticsearch.

Elastic Stack

The Elastic Stack is the next evolution of the ELK Stack.

• Kibana: Visualize your data. Navigate the Elastic Stack.

  Kibana gives shape to your data and is the extensible user interface for configuring and managing all aspects of the Elastic Stack.

• Elasticsearch: Search, analyze, and store your data.

  Elasticsearch is a distributed, JSON-based search and analytics engine designed for horizontal scalability, maximum reliability, and easy management.

• Beats: Beats is a platform for lightweight shippers that send data from edge machines to Logstash and Elasticsearch.
• Logstash: Logstash is a dynamic data collection pipeline with an extensible plugin ecosystem and strong Elasticsearch synergy (协同效应).