What is the most common form of spam?

The most common form of spam is unsolicited email, often referred to as "junk email." This type of spam typically promotes products, services, or scams and is sent in bulk to numerous recipients without their consent. Other common forms include spam comments on blogs and social media platforms, as well as unwanted messages in instant messaging services. These spam messages can be annoying and may pose security risks if they contain malicious links or attachments.