A flash is a device used to provide additional light when taking photographs, especially in low-light conditions. Many modern cameras feature a built-in flash that automatically activates in low light or can be manually controlled through various modes such as Auto, Red-eye reduction, Off, On, or Slow sync. Built-in flashes are convenient for casual shooting but often have limited power and range.
For more creative control, many SLRs, mirrorless cameras, and some advanced compact cameras allow the attachment of an external flash via an accessory shoe. External flashes often provide higher output, adjustable angles, and support for off-camera use through sync sockets or wireless triggers. Photographers can use these setups to achieve professional lighting effects, control shadows, and improve overall image quality in both studio and outdoor photography.