<human>:  What is the difference between a Mac and a PC?
<bot>: The main difference between a Mac and a PC is the operating system. Macs use Apple's proprietary macOS while PCs use either Microsoft Windows or Linux. Additionally, Macs tend to be more expensive than similarly configured PCs and often come with built-in software like iLife and iWork that are not available for PCs. Macs are also known for their sleek and slim design. PCs come in a variety of shapes and sizes and often have more customization options than Macs.