We have IP cameras in different resolutions. The resolution is the size of the video the camera produces. For example, a 2 MegaPixel camera has a resolution of 1920x1080 pixels, but 5 MegaPixel is 2.5 times larger. 4K ultra HD is even 4 times larger than 1080p.
Resolution is a name for the number of pixels of an image (e.g. the image from IP cameras). The higher the resolution, the larger the image. This is often confused with sharpness, but that is not entirely true.
With IP cameras we have different resolutions, the resolutions that are currently in our assortment can be seen at the blue buttons above. The higher the resolution of an IP camera, the larger the video image. The larger the video image, the more details you can see.
Often the higher the resolution, the "sharper the image" is thought of. It is indeed true that a 43 inch ultra HD TV is sharper than a 43 inch 1080p HD TV, that is because the surface area of the image remains the same, but the number of pixels at 4K ultra HD is four times as large.
This is no different with surveillance cameras. If you would display the image of a 2 MegaPixel and an 8 MegaPixel camera on the same screen, then the 8 MegaPixel camera is absolutely sharper. This is because the image is reduced in that case. If you would look at both images at true size, then they are both equally sharp, only the image of the 8 MegaPixel camera is four times as large, so you can recognize details much better.