Final answer:
The area ranging from 18 inches to 4 feet is referred to as the Personal Zone. Personal space is an individual's preferred distance from others in social interactions. Different cultures and individuals have varying comfort levels and norms when it comes to personal space.
Step-by-step explanation:
The area ranging from 18 inches to 4 feet is referred to as the Personal Zone. Personal space is an individual's preferred distance from others in social interactions. Different cultures and individuals have varying comfort levels and norms when it comes to personal space. For example, some people are most comfortable maintaining an arm's length of space between each other when talking face to face, while others may be comfortable standing closer or farther apart based on their cultural background.