Platelet
Platelet explained in an easy to understand way:

Imagine you're trying to fix a leaky garden hose with a small piece of duct tape. Just like how the duct tape acts as a temporary patch to stop water from gushing out, platelets act as patches that help stop bleeding when you have a cut. In this analogy, the duct tape represents the platelets that gather at the site of a wound to form a clot, much like the tape seals the leak in your hose, preventing further water loss.
Practice Version

Platelet: A cell fragment that helps form blood clots. Platelet. Platelets are tiny pieces of cells in the blood that help stop bleeding by forming clots.