Note - Day 1 - Computer

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Computer is a electronic device manipulates information or data. Also ability to store,retrieve and process data
   Desktop computers
   Laptop computers - battery or AC powered personal computers
   Tablet computers
   Servers - servers up information to other computers on a network
Components basically specialized computers
   Mobile phones
   Game consoles
   Tv

Operating system is the most important software on a computer, manages computer's memory process and it's hardware and software.
Mostly used operating systems are Mac OS , Windows and Linux.

Personal computers are PC s typically include Windows operating system, introduced in 1981 and there are 
  • client versions( for PCs,laptops,desktop computers)
  • server versions(for servers)
  • device versions(for mobile phones,appliances,embedded devices)
 and also some versions which are canceled out.

MAC computers use operating system,Mac OS X was introduced in 1984 and the powered by Apple.

  • Mac OS  X Beta
  • Mac OS  X 10.0 Cheeta
  • Mac OS  X 10.1 Puma
  • Mac OS  X 10.2 Jaguar
  • Mac OS  X 10.3 Panther
  • Mac OS  X 10.4 Tiger
  • Mac OS  X 10.5 Leopard
  • Mac OS  X 10.6 Snow Leopard
  • Mac OS  X 10.7 Mountain Lion
  • OS X 10.8 Mountain Leopard
  • OS X 10.9 Mavericks
  • OS X 10.10 Yosemite
  • OS X 10.11 El Captan
  • macOS 10.12 Sierra 
( types of the computers and the versions of them)

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