CompactFlash (CF) is a type of memory card format that was popularized in the early days of digital photography and remains in use in certain professional and industrial applications. It was developed by SanDisk in 1994 and has since been adopted by various camera manufacturers and other devices.

Physical Size: CompactFlash cards are larger in physical size compared to modern memory card formats like SD, measuring 43mm × 36mm × 3.3mm.

Storage Capacity: CompactFlash cards have historically offered larger storage capacities compared to other memory card formats, with some models reaching up to several hundred gigabytes.

Durability: CompactFlash cards are known for their robustness and durability, making them suitable for use in rugged environments and professional settings.

Data Transfer Speeds: CompactFlash cards have supported various data transfer protocols over the years, with newer versions offering faster read and write speeds.

Usage: CompactFlash cards were widely used in digital cameras, especially professional DSLRs, before the popularity of SD cards increased. They are still used in some high-end cameras, as well as in certain industrial and embedded systems where robustness and reliability are critical.