Strobes and speedlights are both flash units used in photography but have some key differences. Strobes, also known as studio flashes or monolights, are larger and more powerful flash units typically used in studio settings. Strobe lights are often connected to a continuous power source for consistent power output and flash duration. Speedlights, or hot shoe flashes, are flash units that are battery-powered and attach to the camera's hot shoe. They are less powerful than strobes but offer greater portability.