Datatypes are specific details in your database. They are used to indicate what sort of value is used: a character, a number, a string of text, etc.
The datatype string is a type that contains a series of signs or characters with a fixed or variable length. All signs and characters on a keyboard can be included. The datatype string can be used for: email address, first name, address information, as well as telephone numbers.
The datatype integer displays a sequence of numbers that contains a maximum of 2,147,483,647 characters. All numbers on a keyboard can be included. The datatype integer can be used for interest fields, for example. You start at 0, and you can use triggers to increase the number by +1 every time someone clicks on this topic.
The datatype big integer is a type that contains a sequence of numbers with a maximum number of 9,223,372,036,854,775,807 characters. All numbers on a keyboard can be included. The database big integer can be used for the same kind of content as the datatype integer, but it can include far more numbers, making it suitable for large calculations.
The datatype date is a type that can be used to save a date, whereas the datatype date-time can do the same while also allowing a time to be included. The datatype date can be used for birth dates, for example.