The part of the cell that encloses the cytoplasm and organelles is the cell membrane.

Here's a breakdown:

* Cytoplasm: The gel-like substance that fills the cell and contains the organelles.

* Organelles: The functional components of a cell, such as mitochondria, the nucleus, and the Golgi apparatus.

* Cell membrane: A thin, flexible barrier that surrounds the cell and regulates what enters and leaves. It's made of a phospholipid bilayer with embedded proteins.

Think of the cell membrane like the skin of a balloon: It's a thin, flexible layer that holds everything inside, allowing only specific things to pass through.