Megapixels are a measure of the resolution of a digital image, and refer to the number of pixels that make up an image. Generally, the higher the number of megapixels, the higher the image resolution, which means that the image will be more detailed and have more clarity.

Here are some of the factors that are affected by the number of megapixels in a digital image:

1. Image size: The number of megapixels in a digital image determines its size. The higher the number of megapixels, the larger the file size will be, and the more storage space it will require.
2. Print quality: The number of megapixels in an image also affects its print quality. Higher megapixel counts result in images that can be printed at larger sizes without losing detail or appearing pixelated.
3. Detail and sharpness: The number of megapixels can also affect the level of detail and sharpness in an image. Higher megapixel counts allow for finer details and more accurate representations of the subject.
4. Cropping and editing: Higher megapixel counts also allow for more flexibility in cropping and editing digital images. Images with more megapixels can be cropped without losing as much detail, and can be edited with greater precision.
5. Low light performance: While megapixels can have an impact on image quality, it is important to note that they are not the only factor that affects image quality. In low light situations, other factors such as sensor size, sensitivity, and lens quality are also important for capturing high-quality images.

In summary, megapixels are an important factor in determining the resolution of a digital image. While higher megapixel counts generally result in higher image resolution, it is important to consider other factors such as print quality, detail and sharpness, cropping and editing, and low light performance when evaluating the overall quality of a digital image.