Accessories A Must Have!

DIGITAL CAMERAS:

Digital cameras can be classified into several categories:
1) Compact digital cameras~designed to be small and portable.
2) Bridge cameras~higher-end digital cameras that physically resemble DSLRs and often have superzoom lenses.
3) Digital single lens reflex cameras~(DSLRs) are digital cameras based on film single-lens reflex cameras (SLRs), both types are characterized by the existence of a mirror and reflex system.
4) Digital rangefinders~A rangefinder is a user-operated optical mechanism to measure subject distance. Most digital cameras measure subject distance automatically.
5) Professional modular digital camera systems~very high end professional equipment, these cameras are used in studios for commercial production.

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CAMCORDERS:

The evolution of the camcorder has seen the growth of the camcorder market as price reductions and size reductions make the technology more accessible to a wider audience. When camcorders were first introduced, they were shoulder-operated and extremely bulky and cost over $1,500.
As of 2008, a camcorder can fit in the palm of a person's hand and is sold at a retail price of approximately $100.

Camcorders are often used in the production of low-budget TV shows where the production crew does not have access to more expensive equipment, and even movies have been shot entirely on consumer camcorder equipment such as Blair Witch Project and 28 Days Later.
Even high-budget cinema is done using camcorders in some cases; George Lucas used Sony CineAlta camcorders in two of his three Star Wars prequel movies.
This process is referred to as digital cinematography.

Accessories you might be looking for: Filters, Batteries, Lenses, Tapes, Memory, Microphones, Lights, Polarizing, Kits, Cases, Stands.
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CELL PHONES:

With the addition of popular culture, science, and marketing the cellular phone accessories industry has sky rocketed to meet the ever-growing needs of the consumer.
Best Buy late last year launched five specialty stores in New York focused exclusively on selling phones and related accessories. "Once people get used to the idea of the phones not being just for calling, they'll buy other things," says John Zittrauer, sales lead at Best Buy Mobile.

Mobile phone use while driving is common but controversial.
Being distracted has been shown to increase the risk of accident.
Because of this, many governments have banned the use of a cell phone while driving.
Hence many companies have brought out the Hands Free set, available to overcome this problem, although there are still arguments that it can be just as distracting.

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BLUETOOTH

Bluetooth provides a way to connect and exchange information between devices such as mobile phones, telephones, laptops, personal computers, printers, GPS receivers, digital cameras, and video game consoles.
Bluetooth enables these devices to communicate with each other when they are in range.
The devices use a radio communications system, so they do not have to be in line of sight of each other, and can even be in other rooms, as long as the received transmission is powerful enough.

Ever wondered why it’s called Bluetooth?!
Bluetooth was named after a tenth-century king, Harald Bluetooth (an anglicized version of Harald Blaatand) King of Denmark and Norway.
Harald was known for his unification of previously warring tribes from Denmark (where the Bluetooth technology was invented), and Norway.
Bluetooth likewise was intended to unify different technologies, such as personal computers and mobile phones.

Accessories you might be in need of: Cables, Chargers, Adapters, Headsets, Sim Cards, Protectors and Cases.
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MP3

A digital audio encoding format using a form of lossy data compression, it is a common audio format for consumer audio storage.
Digital sampling is used to convert an audio wave to a sequence of binary numbers that can be stored in a digital format

From the first half of 1995 through the late 1990s, MP3 files began to spread on the Internet.
MP3's popularity began to rise rapidly mostly because of it’s portability and so it became a must have gadget.

Accessories you may wish to have: Car Chargers, Adapters, Docks and Cradles, Headphones, Batteries, Speakers, Cables, Remotes, Cases.
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For a history of MP3's, Camcorders, Cell Phones, Digital Cameras and Blutooth take a look at Wikipedia.
For instance: History of MP3.