The mode dial on the right side of the Nikon D3000's top panel provides access to its various exposure modes, the same arrangement of Auto, three semi-auto, and one Manual as found on all Nikon digital SLR, plus a total of seven Scene modes (which Nikon calls "Vari-Programs"), plus a Guide setting that offers a user-friendly interface that guides beginners through the capture and review process, with the Nikon D3000 explaining the various options on offer. Here's a list of what's available:
Auto: The camera sets everything. Used for snapshots or users who just don't want to be bothered with the details of how the camera will do its work. The AF-assist light will come on if needed, and the camera selects the AF point covering the closest subject.
Guide: Provides access to the camera's Record, Playback, and Setup options through one user-friendly, graphically rich menu system. The user is prompted to select the type of photo they're looking to achieve, and then the camera provides a recommended setup. These can then be further customized by the user, with the camera explaining the effect of each individual setting. Fully manual shooting isn't possible in this mode, but manual aperture or shutter adjustment can be made for certain types of photos.
Program: Puts the camera in charge of aperture and shutter speed, though all remaining camera settings are available. You can vary the combination of aperture and shutter speed the camera has selected by rotating the Command Dial. 
Shutter Priority: The user controls shutter speed, from 1/4,000 to 30 seconds, while the camera sets the aperture value.
Aperture Priority: The opposite of Shutter Priority mode, this mode lets the user control the aperture, while the camera sets the shutter speed. Available apertures depend on which lens is mounted on the camera.
Manual: Gives the user complete control over the exposure (both shutter and aperture settings), and provides access to the camera's Bulb shutter setting for exposures longer than 30 seconds.
Night Portrait: Uses slow shutter speed with flash, balancing the two so that night portraits look natural even with flash. Closest-subject AF is used. Use a tripod to avoid blurring.
Close up: Reds and greens are pumped up, camera selects center focus point, but other points can be chosen with the Multi-Selector. The built-in flash will pop up and fire if the lighting is too dim; tripod use is recommended. 
Sports: Uses higher shutter speeds, camera switches to continuous focus while the shutter button is held down halfway, tracking the subject in the center focus area. If the subject leaves the central AF area, the camera will follow it and judge focus from the other focus areas. The beginning AF area can be chosen with the Multi-selector. Both flash and AF illuminator are turned off and will not fire. 
Child: This mode boosts sharpness and saturation for clothing and background details, but renders skin tones soft and natural-looking. The built-in flash will pop up and fire if the lighting is too dim. 
Landscape: Boosts color saturation, contrast, and sharpening for city and forest landscape shots. Closest-focus AF is used, and the flash and AF-assist light are turned off in this mode. Use of a tripod is recommended in low light conditions. 
Portrait: Adjusts the lens aperture to soften background details to help the main subject stand out more clearly. Sharpness and color saturation are moderated somewhat, to give softer, more natural-looking skin tones. The built-in flash will pop up and fire if the lighting is too dim. 
Auto (Flash Off): In this mode, exposure is automatic but the flash is disabled, and the camera will vary the ISO up to a maximum of 3,200, to capture images using available light. The AF-assist light will come on if needed, and the camera selects the AF point with the closest subject. This mode is great for museums and other places where flash isn't permitted, more natural-looking indoor shots, etc.
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