A breach of confidentiality that involves entering someone's space without permission is known as what?

Invasion of privacy is the correct term for a breach of confidentiality that occurs when someone enters another person's personal space without permission. This concept encompasses various forms of privacy violations, including unwarranted intrusion into someone's private life, whether physical, electronic, or personal.

It is essential to understand that invasion of privacy can manifest in different ways, such as unauthorized access to an individual’s physical environment or their personal data. The core aspect is the lack of consent, which constitutes a violation of an individual's right to maintain their personal space and confidentiality.

The other options, while related to issues of privacy and reputation, do not pertain specifically to the physical act of entering someone’s space. Defamation involves damaging someone's reputation through false statements, while slander refers specifically to verbal defamation. The term "legal" does not accurately describe a breach of confidentiality or privacy. Thus, invasion of privacy captures the essence of the scenario presented.