What do you mean by file and folder? Write the types of files and folder extensions.

A file is a named collection of data stored on disk (letter, photo, program). A folder (directory) is a container that organizes files and other folders hierarchically, e.g. D:\Office\Letters.

Common file types and extensions:

1. Document: .docx, .pdf, .txt — Word, PDF, Notepad.
2. Spreadsheet/DB: .xlsx, .csv, .accdb — Excel, Access.
3. Presentation: .pptx — PowerPoint.
4. Image: .jpg, .png, .gif — photos, screenshots.
5. Audio/Video: .mp3, .mp4 — sound, video.
6. System/Compressed: .exe, .zip — programs, archives.

Extension tells Windows which program opens the file and is vital for correct sharing and printing in offices.