lake house = data lake + data warehouse.
stores raw, unstructured, and semi-structured data cheaply, often on object-storage like a data lake.
supports ACID transactions, structured data, schema enforcement, and fast SQL based Analytical Queries.
Basically, lakehouse = store all your data, and run different kind of loads on them - analytics, machine learning, Bi etc, without moving around data.
Common solutions include: Databricks lakehouse, Apache Iceberg, Apache Hudi, Delta Lake, LanceDB etc.,