Here's a breakdown:

* Intracellular fluid is the fluid found inside cells.

* Extracellular fluid is the fluid found outside cells, and it makes up about 1/3 of the total body water.

Extracellular fluid is further divided into two main categories:

* Interstitial fluid: The fluid that fills the spaces between cells in tissues.

* Blood plasma: The liquid component of blood.

Other important extracellular fluids include:

* Lymph: A fluid that circulates through the lymphatic system, collecting waste and transporting it to the blood.

* Cerebrospinal fluid: The fluid that surrounds the brain and spinal cord.

* Synovial fluid: The fluid that lubricates joints.

Let me know if you'd like to learn more about any of these fluids!