Google Home is a line of smart speakers that includes the original Google Home, Google Home Hub, Google Home Mini, and others. The line is marketed under the Google Nest brand, which includes a variety of smart home devices, such as the Nest thermostat. With Google Assistant built in, Google Home can answer informational questions, check the weather, manage your calendar, and more.
Google Home refers to two things: the original Google Home smart speaker and the entire product line, including Google Home Hub, Google Mini, and other products.
The original Google Home device is essentially a single two-inch speaker and some computer hardware wrapped in a case that looks like an air freshener. It has built-in Wi-Fi connectivity, which it uses to tap into your Wi-Fi network and connect to the internet.
Google Home was originally designed to compete with the Amazon Echo. It has similar capabilities and functionality, but is built around Google Assistant instead of Amazon's Alexa virtual assistant.