For a beginner who wants to walk down the path of programming and developing and etc. What is a brief explanation of the differences of the two? Edit: To clarify, Computer science is CS while software or computer engineering is IT what is the simple difference between IT and CS? Thank you

Hallow guys, I'm learning programming on my own so I still don't know much. Can you guys help me out here, I need a Python or C program which find the last created file in a certain directory e.g (C:\User\download). it must return the last created file name in string form. thank you