Machine Learning

Bluetooth Improvements Appear in More Devices

By MOLLY WOOD

Minh Uong/The New York Times

An update made in 2010, also called Bluetooth 4.0, uses less power and has better pairing capability.

Amazon's new Fire TV Stick.

State of the Art

Amazon’s Grand Design in Devices

By FARHAD MANJOO

The overall strategy behind the retailer’s hardware lineup appears puzzling. Its devices sound fantastic in theory but often fall short.

App Smart

Spanish as a Second Language, With the Accent on Fun

By KIT EATON

Plenty of smartphone apps offer worthwhile and entertaining lessons.

App Smart Video: Free Spanish Lessons

Jim Wilson/The New York Times

The new iPad Air 2, left, starts at $499, and the iPad Mini 3 starts at $399. At the entry level, both Apple models have only 16 gigabytes of storage space, so the $100 upgrade to 64 gigabytes is highly recommended.

IPad Air 2 and Mini 3 Review: Fantastic, but Largely Unnecessary, Tablets

By FARHAD MANJOO

The iPad Air 2 is substantially faster than its predecessor, and both it and the Mini 3 include Touch ID and Apple Pay. Needless to say, both products are costly.

Q&A

Sorting the Phone’s Address Book

By J.D. BIERSDORFER

Also, using Google Maps “Lite” and private searches in OS X Yosemite.

Q&A

Shining a Light on Nosy Apps

By J. D. BIERSDORFER

Plus, creating a fund-raising page on Facebook.

More State of the Art

State of the Art

Apple Strengthens Pull of Its Orbit With Each Device

By FARHAD MANJOO

The tech giant has succeeded in ensuring that its phones, tablets and computers work seamlessly together. You might never leave.

State of the Art

The Samsung Galaxy Note 4 phone includes a stylus, a handy tool for interacting with the device’s large display.

Samsung’s Superior Note 4 Smartphone Gives Glimpse of Computing’s Future

By FARHAD MANJOO

With a half-dozen new features that will delight users, Samsung’s latest smartphone may have its owners forgetting about all their other computers.

More Machine Learning

Machine Learning

GoPro Cameras Face Simpler Competition

By MOLLY WOOD

If you just want a portable, easy-to-operate still and video camera, it’s worth taking a look at some alternatives now on the market or coming soon.

Video: GoPro or Go Budget

Machine Learning

Apple says Apple Pay is more secure than a traditional credit card payment, because the system sends one-time codes to merchants to complete purchases rather than actual credit card numbers.

Apple Pay: Seamless in Stores, but Quirky Online

By MOLLY WOOD

Integrating the new payment system with varied apps still has some flaws, but brick-and-mortar purchases are easy and fun.

As Apple Pay Arrives, Witnessing the Next Step in Money. Maybe. NYT Now

More App Smart

App Smart

Don’t Be Afraid of These Halloween-Themed Apps

By KIT EATON

Play games, and get ideas for pumpkin carving, recipes and more for the spooky holiday.

App Smart Video: Finding Halloween Fun

App Smart

Positive Thinking, With a Little Help From Your Phone

By KIT EATON

A roundup of apps to help you get happy, or at least figure out what is stressful in your life.

App Smart Video: Finding Happiness

More Gadgetwise

Gadgetwise

Fashion and Functionality Meet in Smart Jewelry

By GREGORY SCHMIDT

Manufacturers are teaming up with designers to produce stylish bracelets, rings and cuff links that are also tech devices.

Gadgetwise

Traded-in iPhones at a warehouse in Louisville, Ky., for Gazelle, which offers an online trading program for cellphones. After a final offer is accepted, sellers can choose to be paid by check, Amazon store credit or PayPal.

How to Get More Room in the Sock Drawer: Sell Your Cellphone

By BRIAN X. CHEN

Mailing your phone to a reseller, handing it to a cellphone store or putting it up for sale online can reduce or fully cover the price of an upgrade.

More Q&A

Q&A

Exporting Video From iPhoto

By J. D. BIERSDORFER

And tips on removing malicious software from browsers.

Q&A

Swatting Spam on Twitter

By J. D. BIERSDORFER

Plus, how to wirelessly connect an old PC to the Internet.

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Featured Columns

Machine Learning

A collection of Machine Learning columns from The New York Times.

State of the Art

A collection of State of the Art columns published in The New York Times.

Q & A

A collection of Q & A columns from The New York Times.

Tool Kit

A collection of Tool Kit columns from The New York Times.

App Smart

A collection of App Smart columns and articles about mobile applications from The New York Times.

More News and Reviews

Wired Well

A series from The Well blog explores how technology can help us better understand our personal health.

Interactive Feature

The Well Guide to Activity Trackers

The Times tested some of the latest and most popular trackers to compare how they work and the various features they offer.

Interactive Feature

What Your Activity Tracker Sees and Doesn’t See

High-tech fitness and activity trackers all share one thing: an accelerometer. Here’s how they work — and don’t.

Teardown Graphics

Gadgetwise

Creativity Unleashed, With the Help of a Little Pi

Raspberry Pi, a tiny computer the size of a credit card, has captured the imaginations of students, educators and tinkerers around the world since it became available in 2012.

Graphic

TOOL KIT

A Sensor Guided by Voice or Gestures

Microsoft wants the Xbox One to be the center of a home’s entertainment universe, providing Skype video calls and playing television shows, music and more.