There are several different types of voice assistants available including: 1. Amazon Alexa: This is an AI-powered voice assistant developed and maintained by Amazon. It can be used on Amazon Echo smart speakers and other compatible devices. 2. Google Assistant: This is another popular voice assistant that is developed by Google. It is compatible with Google Home smart speakers and many Android devices. 3. Apple Siri: Siri is an AI-powered personal assistant developed by Apple. It is available on iPhone, iPad, and the HomePod speaker. 4. Microsoft Cortana: This is an AI-powered virtual assistant developed by Microsoft. It is integrated into Windows 10, Microsoft Edge, and several other Microsoft products. 5. Samsung Bixby: This is an AI-powered voice assistant developed by Samsung. It can be found on Samsung smartphones and smart home devices. 6. IBM Watson Assistant: This is an AI-powered assistant designed for businesses. It can be integrated into websites, mobile apps, and other business applications.