Logstash is Elastic's server-side data processing pipeline, first created by Jordan Sissel in 2009, using an input-filter-output model and 200+ plugins to centrally clean multi-source data and forward it to Elasticsearch, Kafka, S3, and more.
Kibana, released by Elastic in 2012, is a data visualization platform that presents Elasticsearch data through a browser interface, supporting dashboards, Lens drag-and-drop charting, and alerting as the visualization frontend of the ELK Stack.
Elasticsearch, released by Elastic in 2012, is a distributed search and analytics engine that scales to PB-level data with sub-second full-text retrieval, forming the core of the ELK Stack with 40M+ monthly downloads.