Resolution is the minimum separation of two distinguishable objects in an image. Due to wave nature of light, the images get meshed i.e. the diffraction patterns overlap.
Rayleigh criterion: The two images are resolvable if the center peak of one image is exactly over the first minimum of an another image.
Take a look to see how different variables affect to the resolution of optical device.
On a dark night you look down a deserted road and see a distant light growing brighter, brighter... Then it splits into two distinct points of light: the headlights of a car coming towards you! At that moment, how far away is the car?
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