Cortana is a digital assistant developed by Microsoft, while Alexa, Siri, and Google Assistant are developed by Amazon, Apple, and Google, respectively.

Siri was first introduced as a feature on the iPhone 4S in 2011.

Alexa is the digital assistant developed by Amazon and is primarily designed for use with Amazon's Echo devices.

Digital assistants are designed to perform a wide range of tasks, including playing music, setting alarms, answering questions, and controlling smart devices.

Google Assistant is known for its strong integration with Google services, such as Gmail, Calendar, and Maps.

Digital assistants employ a combination of machine learning, natural language processing, and deep learning to understand user requests and provide relevant responses.

Cortana is the digital assistant developed by Microsoft and is primarily designed for use with Microsoft's Windows operating system.

Natural language processing (NLP) is the term used to describe the ability of digital assistants to understand and respond to natural language commands.

Siri is the digital assistant developed by Apple and is known for its strong integration with Apple devices and services.

Digital assistants are primarily used to improve productivity by automating tasks, providing information, and controlling smart devices.

Bixby is the digital assistant developed by Samsung and is primarily designed for use with Samsung's Galaxy devices.

Machine learning is the term used to describe the ability of digital assistants to learn and adapt based on user interactions.

Alexa is the digital assistant developed by Amazon and is known for its strong integration with Amazon's Alexa platform.

Conversational AI is the term used to describe the ability of digital assistants to engage in natural and conversational interactions with users.

Google Assistant is the digital assistant developed by Google and is primarily designed for use with Google's Android operating system.