Cube: Collection of dimension table and Fact table with their relation(At least one relation should be there).
Cube is a entity where we can measure the business.
what is schema in data warehouse
Schema: How the dimension and fact tables having the relation in the database.
Type of Schema:
Star: If the fact table is directly related with all dimension tables, then it will be Star Schema.
Snow flake: If your schema is not a star, then it will be Snow flake schema
Stat Schema will give good performance.
Most of the projecta will have Snow flake schema.