A modern data dictionary is the go-to tool for the humans of data (i.e. you) to understand everything about their data sets and verify data credibility at a glance.
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Alternative data is a specific type of external data that’s complex, unique, unstructured and unexplored. It's often considered big data.
A data mart is a subset of a data warehouse. It stores highly organized data for a particular function or team such as marketing, sales or finance.
A data warehouse stores large quantities of structured data from multiple data sources and transactional systems such as CRMs and ERPs.
A data lake stores a collection of various raw data sets from multiple internal and external data sources. The data can be unstructured, semi-structured or structured.