Structured Query Language (SQL) is the language we use to get information from SQL databases.
An SQL database looks like this:
It's just a collection of tables. Each table as a name.
In the table called 'customer', there are data about customers. The business who made it decided they wanted to store each customer's first name and last name.
So they created columns for these.
Each customer has their own row. Their details are stored in the appropriate columns.