No, we're not talking about X-ray vision, thermal cameras or millimeter wave scanners.
If you bought a camera that doesn't have a password, exchange it for a different model.
Without an encrypted connection, anyone who stumbles across it online can watch it.
If you've ever had a tech support agent get on your computer remotely to change settings or try to fix a problem, they used a RAT.
Fortunately, RATs require your permission to let someone onto your computer remotely; the person can't just take control.
You might have an internet-enabled security camera, or smartphone or tablet.