Petri dish
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A Petri dish is a shallow, flat dish used in laboratories to grow and observe biological cultures, such as bacteria or other microorganisms. It matters because it's a fundamental tool that allows scientists to study living organisms in a controlled environment, which has been essential for medical research, disease diagnosis, and understanding how life works.
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A glass Petri dish, Mac Conkey agar and medium
A Petri dish (alternatively known as a Petri plate or cell-culture dish) is a shallow transparent lidded dish that biologists use to hold growth medium in which cells can be cultured, originally, cells of bacteria, fungi, and small mosses.