Spam

Definition:
Spam refers to unsolicited emails that are sent to a large number of recipients, usually for marketing purposes. These emails are often sent by corporates as a means to promote their products or services to a wide audience.

Explanation:
1. Unsolicited emails: Spam emails are unsolicited, meaning they are sent without the recipient's consent or request. The recipients may not have subscribed to any mailing list or shown any interest in receiving promotional emails from the sender.

2. Sent by corporates: Spam emails are typically sent by corporates or businesses as a marketing strategy. These corporates aim to reach a large number of potential customers and promote their products or services effectively.

3. Marketing materials: Spam emails serve as marketing materials for corporates. They often contain promotional content, such as special offers, discounts, or information about new products. The purpose is to generate interest in the recipient and encourage them to make a purchase or engage with the company.

4. Trash: The option 'A' - trash, is not an accurate term for unsolicited emails. While recipients may consider spam emails as unwanted or annoying, labeling them as trash does not accurately describe their nature or purpose.

5. Business messages: The option 'C' - business messages, is a broad term that encompasses various types of communication between businesses. While spam emails can be considered a form of business message, not all business messages are spam emails.

6. Corporate emails: The option 'D' - corporate emails, refers to emails sent within a corporate or business environment. These emails are typically internal communications between employees or with clients, partners, or suppliers. Spam emails, on the other hand, are typically sent to external recipients and are not part of regular corporate communication.

7. Promotions: The option 'E' - promotions, is a term often used to describe the content of spam emails. However, spam emails are not limited to promotions and can also include other types of marketing materials, such as newsletters or event invitations.

In conclusion, the correct term for unsolicited emails sent by corporates as marketing materials is spam. This term accurately describes the nature, purpose, and common perception of such emails.