Trino is a distributed SQL query engine designed for interactive analytics on large datasets across heterogeneous data sources. Originally created at Facebook as Presto and later rebranded as Trino, it enables federated queries where you can join data from multiple data sources (databases, data lakes, object storage) through a single SQL interface without moving the data. Trino's MPP (massively parallel processing) architecture separates compute from storage, making it ideal for modern data lakehouse architectures. Key mental model: Trino doesn't store data — it's a query engine that coordinates distributed execution across worker nodes, pushing down operations to data sources whenever possible and pulling only necessary data into memory for processing.