I want to store data for future use, do i need a database. is there another way of storing data in real time

Question

do i need to use any database modules, if so where can i get them & how can i use them?
program should be able to collect all input at different times and present the output for each customer if need be.

Answer 1

I'm guessing outside my knowledge but... SQL?

Answer 2

If you want to avoid database, you can have static data with input/output on file system...

But I guess @Ahri Fox answer suggest use of SQLite, wich is useful local file based lite database engine using SQL language ( if avoiding a database is more a question of having a database server available ^^ )