The speaker discussed QuestDB, an open-source time series database that specializes in ingesting and querying time-based data. They highlighted that QuestDB is optimized for performance in small machines, making it accessible to users with limited resources. The database prioritizes developer experience by providing out-of-the-box performance and simplicity with SQL querying. Additionally, the speaker demonstrated the database's ability to handle large data sets and perform real-time queries on ingested data. They also mentioned the importance of hardware configuration and optimizing certain aspects, such as storage and indexing, for time series data. The speaker encouraged the audience to contribute to QuestDB's open-source community and address any questions during the talk.