USB Explained: Standards, Cables, Charging and More

Welcome to usb.info, an independent editorial site built for anyone who wants clear answers about USB. USB touches almost every device you own: phones, laptops, keyboards, cameras, external drives, game consoles and chargers. Yet the naming behind it is notoriously confusing, and product boxes often leave out the details that actually matter, such as which USB generation a cable supports or how much power a charger can deliver.

We are a team of technology editors, not a shop and not a testing lab. Our job is to explain how USB works in plain language, to keep our guides updated as new standards appear, and to help you understand what to look for before you buy anything. We do not publish rankings, test reports or scores, because a single best cable or charger for everyone rarely exists. Instead we describe how the technology works so that you can judge a product for yourself.

What you find here

On usb.info you can move from a broad overview to focused detail. The overview pages explain USB standards and speeds, the many connector types, how charging over USB-C and Power Delivery works, and how to choose cables, chargers, hubs, docks, sticks and external drives. From there, our in depth articles at /guides/ dig into specific topics such as USB4 and Thunderbolt, Power Delivery and Extended Power Range, USB security, or how to troubleshoot a connection that refuses to work.

Three quick answers

Most visitors arrive with one of three questions, so here they are up front.

• Which cable do I need? Check the connectors on both ends, the USB generation printed or listed on the packaging, and whether you need the cable for charging, data transfer or both. Our buying guide walks through this step by step.
• Which charger do I need? Look at the wattage your device can accept and whether the charger supports USB Power Delivery. Our charging guide explains the numbers behind the labels.
• Which speed do I actually get? Marketing names such as USB 5Gbps or USB 40Gbps refer to a maximum, not a guarantee. Our standards overview lists every version with its real speed.

News and updates

The USB world keeps moving. New connector generations, new Power Delivery revisions and changing regulations, such as the EU rules on charging ports, all affect the cables and chargers on shelves. usb.info follows the standards published by the USB Implementers Forum and other relevant bodies, and we publish short, factual news items whenever something changes that affects everyday buying decisions. Our overview pages and articles are revised whenever a new standard or naming convention appears, so you can treat them as a current reference rather than a one time snapshot.

How to use the glossary

USB terminology mixes technical terms, marketing names and abbreviations, which can make even a short product description hard to parse. Our glossary lists these terms from A to Z, each with a short, plain explanation and a link back to the article where the term is discussed in more depth. If you come across an unfamiliar word anywhere on this site, such as e-marker, Alternate Mode or PPS, the glossary is the fastest way to look it up. It also works well as a starting point if you simply want to browse and understand how the pieces of the USB standard fit together.

Whatever brought you here, whether you are choosing a single cable or planning a full desk with a dock, several monitors and external storage, usb.info aims to give you the background to make that choice with confidence, without steering you toward a specific brand or product. If you are ready to see product categories, our shop overview is organised the same way our guides are.