Beats is the platform for building lightweight, open source data
shippers for many types of operational data you want to enrich with
Logstash, search and analyze in Elasticsearch.

Filebeat is a lightweight, open source shipper for log file data. As the
next-generation Logstash Forwarder, Filebeat tails logs and quickly
sends this information to Logstash for further parsing and enrichment or
to Elasticsearch for centralized storage and analysis.

WWW: https://www.elastic.co/guide/en/beats