Junk E-mail, also known as spam, is unsolicited or unwanted email messages that are sent in bulk to a large number of recipients. These emails are sent out indiscriminately and typically contain advertisements, scams, or other types of unwanted content. Here is a detailed explanation of why junk email is also called spam:

1. Definition of Junk E-mail:
Junk e-mail refers to any unsolicited email that is sent to a large number of recipients without their consent. It often contains promotional or advertising content that is not relevant to the recipients.

2. Origin of the Term "Spam":
The term "spam" originated from a sketch by the comedy group Monty Python, where the word "spam" was repeatedly used in a restaurant scene. The sketch humorously portrayed how unwanted messages can overwhelm a conversation. This term was later adapted to describe unwanted email messages.

3. Similarities to Canned Spam:
Junk email is often compared to canned spam, which is a type of processed meat that is widely available and often considered low-quality. Just like canned spam, junk email is sent out in large quantities and is not personalized or targeted to specific recipients.

4. Bulk Distribution:
Spam emails are usually sent in bulk to a large number of email addresses. The senders use automated software or scripts to generate and distribute these messages. This allows them to reach a wide audience quickly and easily.

5. Unwanted Content:
The content of spam emails can vary widely, but it is typically unwanted and irrelevant to the recipients. It can include advertisements for products or services, phishing attempts, malware, scams, or other types of unsolicited content.

6. Filtering and Blocking:
Due to the prevalence of spam, email providers and software developers have implemented various tools and techniques to filter and block these unwanted messages. This helps users to keep their inbox clean and avoid potential security risks.

In conclusion, junk e-mail is commonly referred to as spam due to its similarities to canned spam and the bulk distribution of unwanted content. The term "spam" has become widely recognized and is used to describe any unsolicited or unwanted email messages.