As the name suggests, mirrorless cameras don't have the mirror like DSLR cameras or the optical viewfinder. However, in other respects those types of cameras are very similar: they utilize same sized sensors, similar interchangeable lens are available, and they deliver equally high image quality.
Mirrorless cameras have been steadily becoming more and more popular in the past few years, including among DSLR camera owners. They are generally smaller and quieter, which makes them not only very portable, but also desirable at events where camera noise might be an issue.
Their smaller size is due to the lack of mirror, which means that the lens can be mounted much closer to the sensor. This allows the smaller camera body design, although mirrorless cameras with a full-frame sensors can still be relatively big.
Mirrorless cameras can sometimes be confused with point-and-shoot cameras. The main difference here is that mirrorless cameras can be used with many different lenses, which brings a whole new world of possibilities. Point and shoots have only one fixed lens you can't change, and usually a much smaller sensor.
One of the main drawbacks of mirrorless cameras is the lack of an optical viewfinder. AIthough electronic viewfinders are constantly getting better and have their own advantages, such displaying the more accurate image of what you're shooting, they are still quite a bit slower than optical viewfinders, especially when shooting continously.
Another limitation of mirrorless cameras is that they need to constantly power both the sensor and the LCD screen while taking photos. That usually translates to shorter battery life and the need for spare batteries.
Read on to see some of the most popular mirrorless cameras today: