Custom PC building involves assembling a personal computer tailored to specific needs and preferences. This process allows users to select individual components, such as the CPU, GPU, motherboard, and RAM, ensuring optimal performance for tasks like gaming, video editing, or general use. By choosing each part, builders can create a system that fits their budget and desired specifications. The benefits of custom PC building include enhanced performance, upgradeability, and cost-effectiveness compared to pre-built systems. Additionally, it offers a sense of satisfaction and personalization, as users can design a machine that reflects their style and requirements. Overall, custom PC building is a rewarding experience for tech enthusiasts.