The main difference between SSD and HDD storage lies in their technology and performance. SSD (Solid State Drive) uses flash memory to store data, offering faster read and write speeds, improved durability, and less power consumption. In contrast, HDD (Hard Disk Drive) utilizes spinning disks and magnetic storage, resulting in slower data access times and potential mechanical failures. The choice between SSD and HDD often hinges on factors like speed requirements, cost, and storage capacity, with SSDs being favored for performance-intensive applications while HDDs are commonly used for larger data storage needs.