What counts as a peripheral
A peripheral is any device that connects to a computer to add a function the computer does not provide on its own, or to provide it in a better form. The computer itself does the processing and storage. Peripherals handle the parts that involve you: typing, pointing, seeing, hearing, printing and moving files in and out.
The word covers a wide range. A keyboard is a peripheral, and so is a printer, a webcam, a headset or a flash drive. Some laptops include a few of these built in, which is why many people only notice peripherals when they move to a desktop or try to set up a more comfortable desk.
It helps to sort peripherals by direction. Input devices send information to the computer. Output devices send information out of it. A few do both.
Input devices
Keyboards and mice are the most familiar. A keyboard sends keystrokes, and a mouse or trackball sends movement and clicks. Both are cheap compared with the rest of a computer, yet they shape how comfortable a day of work feels. Choices such as key feel, size and shape matter more than most buyers expect, and there is a lot of variety in how keys are built. The trade-offs between the two common designs are covered in more detail under keyboard types.
Webcams and microphones capture video and sound for calls and recording. Built-in versions on laptops are convenient, but separate ones can offer better placement. Placement, lighting and privacy habits do much of the work, which is why webcams and microphones deserve their own discussion.
Game controllers, drawing tablets and scanners are more specialized input devices. They are useful for particular hobbies or jobs, and most work the same way as a keyboard or mouse once connected.
Output devices
Monitors and speakers present what the computer produces. Monitors connect through dedicated video ports, which are a separate subject from everyday accessories. If you are adding a second screen, display cables and the ports on both ends are worth checking first.
Headphones and headsets may connect by cable, by a wireless adapter or by Bluetooth, and a headset often combines output and input in one device.
Printers produce paper copies, and many also scan. They are among the more troubleshooting-prone peripherals, because they combine moving parts, consumables and network connections. Home printers have their own set of guides.
Storage and expansion devices
External drives and flash drives add storage you can carry or unplug. They are also a common destination for backups, though a backup plan should not rely on a single device. Backup basics explain how to think about that.
Memory cards are small removable storage used mostly by cameras and similar devices. A card reader on or attached to the computer lets you copy files across.
Docking stations and hubs do not do a job of their own. They multiply connections, so one cable from a laptop can provide several ports. They are useful where a laptop has few ports or where you want to plug in a full desk setup with one connection.
Power-related add-ons
Not every useful accessory is a data device. Surge protectors and backup power supplies sit between the wall outlet and your equipment, and they are meant to reduce the damage from power problems. They are easy to overlook and worth understanding before something goes wrong.
How peripherals connect
Almost every accessory reaches the computer in one of three ways.
- Cable. A wired connection carries data and often power at the same time. Most modern accessories use USB ports and cables of some kind, though the physical shapes and capabilities differ between ports.
- Dedicated wireless adapter. A small receiver plugs into a port and talks to the accessory over a radio link designed for that product.
- Bluetooth. The computer’s own wireless radio connects to the accessory directly, with no adapter, after a one-time pairing step. If Bluetooth is not working, a step-by-step approach to Bluetooth pairing usually finds the cause.
Choosing between cables and radio is a matter of trade-offs rather than a clear winner. Wired devices tend to be simple and do not need charging, while wireless peripherals reduce clutter but add batteries and possible interference.
Drivers, updates and permissions
Most common peripherals work as soon as they are plugged in, because the operating system includes basic support for standard devices. Specialized hardware, such as some printers or advanced mice with extra buttons, may need device drivers or the maker’s software. Install these only from the maker’s official site, and be cautious about any installer that asks for more than the device plainly needs.
Some accessories also receive firmware updates. These can fix problems, but a failed update can leave a device unusable, so follow the maker’s instructions closely and do not interrupt one in progress. Webcams and microphones are also governed by app permissions on the computer, which control which programs may use them.
Comfort and tidiness
Peripherals determine how you sit, reach and type. If you spend long hours at a desk, computer ergonomics and wrist comfort are a good reason to think about the size and position of your keyboard and mouse rather than simply using whatever came in the box. A tangle of cords also makes it hard to see what is plugged into what, so cable management is more than a cosmetic matter when you are troubleshooting.
Buying and troubleshooting in a sensible order
A few habits save frustration:
- Check which ports your computer has before you buy. Adapters work, but they add another thing that can fail.
- Start with the simplest explanation when something stops working: a loose connection, a drained battery, a different port or a restart. Our general troubleshooting steps apply to peripherals as well.
- Test an accessory on another computer or with another cable before assuming it is broken.
- Keep the maker’s documentation or support page bookmarked. It is the most reliable source for repairs and firmware, and it is better than a random video.
- When an accessory reaches the end of its life, dispose of it through electronics recycling instead of the household trash.
Peripherals are mostly inexpensive and replaceable, which makes them a good place to learn how your computer works. The articles in this section take the main categories one at a time and cover how to choose, connect and look after each.