All of it, in plain English

Smart home

The whole thing

A house where devices are connected to each other and can act without a person physically touching them each time.

The bar is low, which is why the phrase gets used for everything. One WiFi bulb technically qualifies. A house where saying “good night” locks the doors, kills the lights, adjusts the temperature and arms the sensors also qualifies. They are not remotely the same product.

IoT

Spoken as “eye-oh-tee”. Short for internet of things

The general name for everyday objects that have been given a small computer and a network connection, so they can report what they sense and take instructions.

A thermostat, a door lock, a water-leak sensor, a delivery van's tracker, a factory conveyor belt. “Smart home” is IoT pointed at a house. Nothing more mysterious than that.

Automation

Also called a rule, or a routine

An instruction of the form: when this happens, do that. Written once, followed forever, exactly as written.

“When the sun sets, turn on the porch light.” The house is not thinking here. It is obeying. This is most of what the industry sells and it is genuinely useful — but it is not AI, and anyone telling you otherwise is selling.

Scene

Sometimes called a mood or a preset

A named bundle of settings across several devices, triggered together.

“Movie night” might mean the living room at fifteen percent, the kitchen off, the sound moved to the room speakers and the porch light left on. One name, five changes.

AI

Artificial intelligence

Software that produces a sensible answer to something nobody wrote a specific rule for.

The difference from automation is worth being precise about. An automation handles “set the thermostat to 74”. AI handles “I'm freezing” — a sentence with no number in it, which could mean a dozen things, and which requires knowing what the temperature already is, whether a window is open, and what you usually mean when you say it.

Language model

Often written LLM, for large language model

The kind of AI that works with ordinary human sentences rather than fixed commands. It is what lets you speak to your house the way you would speak to a person.

This is the piece that arrived recently and changed what is possible at home. Before it, you learned the system's phrases. After it, the system deals with yours — including the vague ones, the half-finished ones, and the ones your visiting mother-in-law makes up on the spot.

Machine learning

Often shortened to ML

Software that improves at a task by looking at examples, rather than by being programmed with rules.

A thermostat that watches you for two weeks and works out that you go to bed near eleven has learned something nobody told it. In business we use the same idea for forecasting demand, spotting fraud, and predicting which machine is about to fail.

Hub

Also called a controller, bridge or gateway

One box in your house that everything else reports to and takes orders from. It is where the rules live and where the decisions get made.

Without a hub, every device answers only to its own app and its maker's servers. With one, they become a system. The choice of hub is the single most consequential decision in a smart home, and it is the one homeowners are almost never consulted on.

The cloud

Someone else's computer

Servers in a data centre somewhere else, reached over the internet, owned and run by a company.

There is nothing wrong with the cloud. The question is what you have put there. A backup, fine. The decision about whether your front door unlocks, and a permanent record of when your family comes and goes — worth thinking about a little harder.

Local, on-premise, edge

Three words for roughly one idea

The work happens on hardware inside your building instead of in a data centre.

Two practical consequences. It is faster, because nothing travels four hundred miles and back to turn on a lamp. And it keeps working when your internet doesn't — which on the Gulf Coast is a real consideration, not a talking point.

Private AI

What we install

An AI assistant running on hardware in your house, so your voice, your habits and your camera footage do not have to leave the building to be understood.

This is the combination of the two entries above, and it is unusual. Most home assistants are a microphone connected to a company's data centre. Ours is a small computer in your utility room that happens to be able to reason.

Matter

A standard, not a product

An agreement between manufacturers that lets their devices talk to each other, so a bulb from one company answers a hub from another.

Before it, buying a smart device meant marrying into whichever family you started with. If you are buying anything new, checking for Matter support is the single easiest way to avoid being trapped later.

Thread, Zigbee, Z-Wave

Ways devices talk

Low-power wireless languages designed for small devices that need to run for a year on a battery, rather than for streaming video.

They also relay for each other, so each device you add strengthens the coverage rather than crowding it. That is why a house with thirty of these can be more reliable than a house with six things fighting over WiFi.

Geofencing

Location-based triggers

The house using your phone's position to know roughly where you are, and acting on it.

Cooling that stays off while the house is empty and starts when you are ten minutes away. An alarm that disarms as you turn into the drive. It only needs to know the boundary you drew, not your whole day.

Sensor

The house's senses

A small device that notices one specific thing and reports it: motion, a door opening, temperature, humidity, water on the floor, smoke, light level.

Sensors are cheap and they are what separates a house that follows rules from a house that responds to reality. A leak sensor under the water heater that shuts off the main by itself has paid for the whole system the first time it works.

Network segmentation

Also called a VLAN or guest network

Keeping your smart devices on a separate lane of your home network from your laptops, phones and anything you bank on.

Cheap devices are the weakest thing on most home networks. Segmenting means that if one of them is compromised, it cannot reach anything that matters. It costs nothing extra to do at install and is almost never done.