Some are smartphones and others are tablet computers, but they all aim to cater to people's growing interest to have easily portable devices that can be used to connect to the Internet, take pictures, watch video, play games and read books, magazines and newspapers.
Google's Nexus devices will be competing with gadgets from such companies as Apple Inc., Amazon.com Inc., Barnes & Noble Inc., Samsung and Microsoft Corp. Microsoft released a new tablet called Surface last week and launched new software for phones on Monday.
The array of phones and tablets hitting the market underscores how much mobile computing is shaking up the technology industry. The shift has undercut sales of desktop and laptop computers, decreasing the amount of revenue that Microsoft gets from licensing Windows and hurting companies such as Hewlett-Packard Co. and Dell Inc. that make the machines.
Although Android has ensured that Google's search engine and other services play a prominent role in mobile computing, Google also is experiencing some short-term pain because the advertising rates on phones and tablets so far haven't been as high as the prices on desktops and laptops.
Advertising accounts for most of Google's revenue. Google's introduction of a larger tablet comes less than a week after Apple announced it's making a smaller, less expensive iPad, with a 7.9-inch (20.07-centimeter) display, to compete with the Nexus 7 and Amazon.com Inc.'s Kindle Fire. The iPad Mini will be available in stores Friday.
Some analysts have questioned whether consumers will balk at the iPad Mini's $329 price for a device with 16 gigabytes of storage. Google is widening the price difference between the iPad Mini and its smaller tablet by cutting $50 off the price of a comparable, 16-gigabyte Nexus 7, to $199.The 8-gigabyte version, which had sold for $199, will be discontinued.
A Nexus 7 with 32 gigabytes of storage is being introduced for $249 in an apparent effort to discourage even more people from buying the iPad Mini. The cheapest Nexus 7 is still pricier than the Kindle Fire, which starts at $159 for a no-frills model.
The Nexus 7 tablets will continue to be sold at Google's Play store online as well as such retailers as GameStop, Office Depot, Office Max, Staples and Wal-Mart.
Analysts estimate Google has sold several million Nexus 7 tablets so far. Google declined to disclose how many units have shipped. The tablet ''has been an amazing success,'' said Hugo Barra, Android's director of product management.
''We had to work extra hard to meet demand.'' Nexus 7 owners have been buying and looking at so much content on the tablet that Google decided to create a larger version with Samsung, Barra said.