In the past mechanical hard drives like these were used as the main information storage location for programs, the operating system and files. Though they can still be used in this way, mechanical hard drives are now typically used to store files, while the operating system and programs are loaded on a separate SSD drive.
Solid State drives (SSD) are over 10x as fast as mechanical drives and make a huge difference in system performance and responsiveness. SSD drives are used in most modern systems for the operating system and applications, but larger SSD drives (240GB+) can also be used to store files.
Video cards remove the task of graphics processing from the main system CPU and provide a separate engine and separate dedicated memory for graphics tasks. This allows for improved smooth motion gaming / video and special shading effects in gaming.
No Operating System
Windows 10 - Full use current mainstream operating system
Windows 10 Pro - Full use current operating system with domain based business networking capability added.