Which service is likely running on TCP port 443?

The service that is likely running on TCP port 443 is HTTPS. This port is the standard for secure HTTP communications, utilizing SSL/TLS to encrypt the data exchanged between a web browser and a server. This encryption is crucial for protecting sensitive information, such as login credentials and payment details, from potential eavesdroppers during transmission over the internet.

While HTTP operates on TCP port 80, which is unsecured, HTTPS on port 443 ensures secure transactions and is widely used for websites that handle sensitive user information. Therefore, when identifying services associated with specific ports, understanding that port 443 is exclusively designated for secure web traffic reinforces the rationale for selecting HTTPS as the correct service for this question. This foundational knowledge of networking and security principles is essential for professionals in the field.