Nuclear pores are tiny openings in the nuclear envelope, which is the membrane surrounding the nucleus of a cell. These pores are made up of proteins and allow the transport of molecules between the nucleus and the cytoplasm. They play a crucial role in regulating the movement of RNA and proteins, ensuring that essential materials can enter and exit the nucleus as needed. Each nuclear pore complex is composed of multiple proteins called nucleoporins. These proteins form a selective barrier, permitting small molecules to pass freely while controlling the passage of larger molecules. This selective transport is vital for maintaining the cell's functions and overall health.