A camera is an optical instrument that captures and records images, which can be photographs or videos. Various types of cameras include still cameras, digital cameras, video cameras, and specialized imaging devices like MRI cameras. Digital SLR cameras are noted for their photo quality, though having more megapixels doesn't necessarily mean better image quality due to sensor size limitations.

1. Camera
An optical instrument that
records images.

2. A camera is an optical instrument that records images that can be stored
directly, transmitted to another location, or both. These images may be
still photographs or moving images such as videos or movies. The term
camera comes from the word camera obscura (Latin for "dark chamber"),
an early mechanism for projecting images.

3. Types of cameras :
Still camera : a device used to take photographs.
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Instant camera : a type of camera with self­developing film
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Digital camera : an electronic device used to capture and store photographs
electronically.
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Video camera : a portable electronic device for recording video images and
audio onto a storage device.

Camcorder : a portable video camera used by consumers.
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Closed­circuit television camera : is used for surveillance that is generally
fixed, with the exception of being able to swivel.
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Professional video camera : is used in commercial television production that
may or may not be mobile.
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Virtual camera : in computing and gaming.
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Range cameras : which produce images of the distance to each point in the
scene.
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Ultrasonography uses ultrasonic cameras that produce images of the
absorption of ultra­sonic energy.
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Magnetic resonance imaging is sometimes called a MRI camera which produce
images showing, internal structure of different parts of a patient's body.
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4. SLR DIGITAL CAMERA

5. A single­lens reflex (SLR) camera is a camera that typically uses a mirror
and prism system (hence "reflex", from the mirror's reflection) that permits
the photographer to view through the lens and see exactly what will be
captured, contrary to viewfinder cameras where the image could be
significantly different from what will be captured.

6. Advantage of digital SLR cameras – Photo Quality
Many compact cameras these days have a huge number of megapixels.
More in fact than a lot of digital SLRs. You could be forgiven for thinking
that this must mean better photos? Unfortunately you'd be wrong. More
megapixels doesn't equal better quality. The problem is the image sensors
on compact digital cameras are just too small. When 10 million pixels are
crammed onto them the individual photosites on the sensor are too small,
and too close together.

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