A computer is a machine for manipulating data according to a list of instructions known as a program.

Computers are extremely versatile. In fact, they are universal information-processing machines. According to the Church–Turing thesis, a computer with a certain minimum threshold capability is in principle capable of performing the tasks of any other computer, from those of a personal digital assistant to a supercomputer, as long as time and memory capacity are not considerations. Therefore, the same computer designs may be adapted for tasks ranging from processing company payrolls to controlling unmanned spaceflights. Due to technological advancement, modern electronic computers are exponentially more capable than those of preceding generations (a phenomenon partially described by Moore's Law).

Computers take numerous physical forms. Early electronic computers were the size of a large room, and such enormous computing facilities still exist for specialized scientific computation — supercomputers — and for the transaction processing requirements of large companies, generally called mainframes. Smaller computers for individual use, called personal computers, and their portable equivalent, the laptop computer, are ubiquitous information-processing and communication tools and are perhaps what most non-experts think of as "a computer". However, the most common form of computer in use today is the embedded computer, small computers used to control another device. Embedded computers control machines from fighter aircraft to digital cameras.

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NPR Topics: Politics & Society

Shopping For Armed Forces In Hemet
Thu, 03 Jul 2008 13:00:00 -0400
For many young people in tiny Hemet, Calif., the first stop after graduation is that town's Armed Forces Career Center. More than five years into the Iraq war, the center provides one-stop-shopping for potential Army, Navy and Marine recruits.
Why Rural U.S. Towns See More Casualties
Thu, 03 Jul 2008 13:00:00 -0400
Residents of Hemet, Calif. know all too well about military casualties. They're not alone — that town's story has been repeated in rural communities across the country. We examine why soldiers from rural areas are more likely to die in combat and how voters in those areas see the Iraq war.
Is Obama Sliding To The Center?
Thu, 03 Jul 2008 13:00:00 -0400
Some of the Democratic candidate's supporters are expressing frustration with what they see as a slide toward the center. Markos Moulitsas, founder of The DailyKos political blog, discusses how Obama is trying to appeal to moderates.

The Talk of the Town

The Chill
Nick Paumgarten Mon, 30 Jun 2008 04:00:00 -0000
If you had stumbled into Banjo Jim’s, in the East Village, on a recent Wednesday night and encountered a sixty-something guy leading a band through a fervent rendition of “Wild Thing,” for an audience of two dozen or so, you might have concluded, “This is lame,” and slipped back . . .
Oily Speculations
James Surowiecki Mon, 30 Jun 2008 04:00:00 -0000
When bad things happen, it’s always nice to have a scapegoat. So, with Americans furious about soaring oil prices, Congress has gone in search of someone to blame. There are a number of usual suspects to choose from, depending on your politics--OPEC, greedy oil companies, lily-livered environmentalists opposed . . .
Obama’s Iraq Problem
George Packer Mon, 30 Jun 2008 04:00:00 -0000
In February, 2007, when Barack Obama declared that he was running for President, violence in Iraq had reached apocalyptic levels, and he based his candidacy, in part, on a bold promise to begin a rapid withdrawal of American forces upon taking office. At the time, this pledge represented conventional thinking . . .

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