The level of detail that viewfinder can display, expressed in pixels, is what this term refers to when it comes to electronic viewfinders.
A clearer, more detailed image will be provided by a higher resolution viewfinder, making it simpler to compose your shots and focus precisely.
A viewfinder’s resolution increases with the number of pixels. Although a high-resolution viewfinder can improve the shooting experience, it is not necessary for all photographers and it can raise the cost of camera. High-resolution viewfinder can be very helpful if you intend to frequently use it (instead of the live view on camera’s screen).