Microfluidic devices are small systems that manipulate tiny amounts of fluids, often at the microliter or nanoliter scale. They are designed to perform various functions, such as mixing, separating, or analyzing samples, and are commonly used in fields like biotechnology, chemistry, and medical diagnostics. These devices typically consist of channels and chambers etched into materials like glass or polymers. By controlling the flow of fluids through these channels, researchers can conduct experiments more efficiently and with greater precision than traditional methods, leading to advancements in areas such as drug development and point-of-care testing.