What is a database?

What is a database?
This used to be an easy question to answer but now there’s so much confusion. This video clears this up a bit.

MongoDB – https://bit.ly/45Uxc16
Azure CosmosDB – https://bit.ly/44MuCt3
Mysql – https://bit.ly/3r1QiUs
MariaDB – https://bit.ly/45AI4BE
Microsoft SQL Server – https://bit.ly/3EurhUS
Oracle – https://bit.ly/3Z80Air
00:00 Introduction
00:19 Is Excel a database?
01:18 SQL Database
03:01 NoSQL
04:41 Data Lake
05:33 Data Lake House