"ELK" is the acronym for three open source projects: 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. The Elastic Stack is the next evolution of the ELK Stack.
A quick introduction to Elastic Stack - ELK
Logs are essential elements for all applications to understand the functioning, analyze, diagnose, and intervene accordingly. One of the simple ways to have proactive management is to check the logs regularly. And react to information that indicates a degradation of the system or the application.