74LS00 Quad 2-Input NAND Gate IC (DIP-14)

A NAND gate is special among basic logic gates because it is functionally complete: wired cleverly enough, NAND gates alone can build an AND, OR, NOT, or any other basic logic function without needing a different gate type at all, which is why digital logic courses spend so much time on it specifically. The 74LS00 packs four 2-input NAND gates onto one DIP-14 chip, making it a practical part both for actually building custom combinational logic circuits and for teaching the fundamentals of how more complex digital logic can be assembled from a single simple gate type. It rounds out the basic trio of AND, OR, and NAND gate chips that cover the overwhelming majority of simple hardware logic design needs.