What is the primary use of a Molex connector?

The primary use of a Molex connector is to provide power to various internal components of a computer, specifically optical drives, hard drives, and case fans. This connector features a distinct design with four pins that deliver both 5V and 12V power, making it essential for powering older types of hard drives and optical drives that do not use SATA power connections. Additionally, many case fans also utilize Molex connectors for power, further solidifying its role in supplying electrical energy to critical hardware components within a computer system. This versatility in powering essential parts of a computer highlights the Molex connector's integral function within PC construction and maintenance.