Computers at the time typically required people to type in commands. Once the Mac came out, people could instead navigate with a graphical user interface. Available options were organised into menus. People clicked icons to run programs and dragged and dropped files to move them.
The Mac introduced real-world metaphors such as using a rubbish bin to delete files. It brought us fonts and other tools once limited to professional printers. Most importantly, it made computing and publishing easy enough for everyday people to learn and use.
Apple sparked a revolution in computing with the Mac. In turn, that sparked a revolution in publishing as people began creating fancy newsletters, brochures and other publications from their desktops.
These concepts are so fundamental today that it's hard to imagine a time when they existed only in research labs - primarily Xerox's Palo Alto Research Centre. Apple co-founder Steve Jobs and his team got much of its inspiration from PARC, which they visited while designing the Mac.
The Mac has had "incredible influence on pretty much everybody's lives all over the world since computers are now so ubiquitous." says Brad Myers, a professor at Carnegie Mellon University's Human-Computer Interaction Institute. "Pretty much all consumer electronics are adopting all of the same kinds of interactions."
Apple didn't invent these tools, nor was the Mac the first to use them. Xerox Corp sold its own mouse-based Star computer, and Apple's Lisa beat the Mac by months. It's impossible to say what would have happened if those machines hadn't flopped with consumers or whether others would have come along if the Mac hadn't.
But the Mac prevailed and thus influenced generations of gadgets that followed.
The Mac owes much of its success to the way Apple engineers adapted those pioneering concepts. For instance, Xerox used a three-button mouse in its Alto prototype computer. Apple settled on one, allowing people to keep their eyes on the screen without worrying about which button to press.
While Lisa had those improvements first, it cost about 10,000 US dollars. The Mac was a "low" 2,495 dollars when it came out on January 24, 1984.
Apple insisted on uniformity, so copying and pasting text and deleting files would work the same way from one application to another. That reduced the time it would take to learn a new program.
And Apple put a premium on design. Early Macs showed a happy face when they started up. Icons and windows had rounded corners. Such details made computers appear friendlier and easier to use - at least subconsciously - to the user, Mr Myers says.
One of the first applications enabled by the Mac's interface was desktop publishing.
Early computers generated text the way a typewriter would - character by character, one line at a time. Users had a limited number of characters, with no variation in appearance. The Mac was one of the first to approach displays like a TV: Text gets incorporated into a graphic that the computer projects on the screen pixel by pixel.
With those tools, would-be publishers could change fonts, adjust typeface sizes and add attributes such as italics. They could also mix images with text. The earliest Macs popularised "what you see is what you get," or WYSIWYG; formatting on the screen largely reflected how the page would look in print. Instead of going to a professional printer, anyone could simply design and print newsletters on a Mac.
Of course, the Mac's success was never guaranteed.
Initially, many people "thought it was a waste of time and a gimmick," says Dag Spicer, senior curator of the Computer History Museum in Silicon Valley.
He says long-time computer users already knew how to perform computing tasks "very efficiently with just two or three keystrokes. It might have been more efficient for them than to use a mouse."
The Mac didn't run software for the company's Apple II computer, so there was little people could do with it until Aldus - now part of Adobe - released PageMaker publishing software in 1985. The original Mac had little memory and a small screen, and it lacked a hard drive. Although the Mac's processor was fast for its time, much of that power went to the graphical interface instead of tasks common for research and commerce.
With the Mac came "the dawn of the notion of we can waste computing power to make it easier for people," says Jim Morris, who worked on the Xerox Alto before joining Carnegie Mellon by the time the Mac came out. "The Macintosh was not a business machine."
Tim Bajarin, a Creative Strategies analyst who has followed Apple for more than three decades, says he was baffled, yet intrigued when he saw the Mac's unveiling at an Apple shareholders meeting in 1984.
"This really was a complete departure from the computing that we knew," he says. "None of us had any clue what its potential would be."
In fact, despite its radical interface, sales were lukewarm. For years, it was mostly a niche product for publishers, educators and graphics artists. Corporate users stuck with IBM and its various clones, especially as Microsoft's Windows operating system grew to look like Mac's software. (There were years of lawsuits, capped by a settlement.)
Now the world's most valuable company, Apple nearly died in the 1990s as its market share dwindled. After a 12-year exile from Apple, Steve Jobs returned in 1997 to rescue and head the company. A year later, he introduced the iMac, a desktop computer with shapes and colours that departed from beige Windows boxes at the time.
Then came the iPod music player in 2001, the iPhone in 2007 and the iPad tablet in 2010. They weren't Macs, but shared the Mac's knack for ease of use. Elements such as tapping on icons to open apps have roots in the Mac. The popularity of these devices drove many Windows users to buy Macs.
In recent years, PCs have declined as consumers turn to mobile devices. Apple sold 16 million Macs in the fiscal year ending September 28, down 10% from a year earlier. By contrast, iPhones sales grew 20% to 150 million and iPads by 22% to 71 million.
The Mac has aged to the point that it's starting to draw inspiration from iPhones and iPads. Several Mac apps have been refined to look and work more like mobile versions. Macs now have notifications and other features born on mobile devices. Windows computers, meanwhile, now emphasise tablets' touch-base interfaces.
Yet without the Mac, we may never have had the iPhone or the iPad, and phones might do little more than make calls and send email.
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