Unsolicited or unsolicited electronic messages sent in bulk. The term "spam" is often used to describe mass emails that contain commercial advertisements or questionable offers, but it can also refer to unsolicited messages in other digital media, such as social networks, text messages, and blog comments. Spam can simply be annoying, but it can also be used to send malware, phishing attempts and other harmful activities. Various techniques and tools, including spam filters and blacklists, are used to combat spam and minimize its impact on users.