This document discusses polyglot persistence, which is using multiple specialized databases rather than a single general-purpose database. It provides examples of VidaXL's use of polyglot persistence, including MySQL, MariaDB, PostgreSQL, SOLR, Elasticsearch, MongoDB, Couchbase, and Prometheus. The benefits discussed are using the right database for each job and gaining flexibility as the company transitioned to microservices. Challenges included increased complexity, and solutions involved automation, tooling, and hiring database experts.