A solid-state drive (SSD) is a type of storage device that uses flash memory to store and retrieve data. Unlike traditional hard disk drives (HDDs) that use spinning magnetic platters, SSDs have no moving parts, making them faster, more durable, and energy-efficient. When considering an SSD, factors to consider include storage capacity, performance specifications (such as read/write speeds), interface (SATA, NVMe), and brand reputation. Popular SSD brands include Samsung, Crucial, Western Digital, Kingston, and Sandisk.