A spammer is an individual or organization that sends unsolicited and often repetitive messages or advertisements, typically via email or social media, to a large number of recipients without their consent. These messages are often irrelevant, annoying, and can potentially contain malicious content. Spammers use automated software or bots to send out these messages in bulk, with the intention of promoting their products or services, spreading scams, or gathering personal information. The act of spamming is considered unethical and can result in legal consequences.