(Ignoring the posts about the food product.)
A spammer is someone who sends spam. The definition of spam has expanded since its original use, but I would define it as an unsolicited or unwanted message or messages. In our home, we call random phone calls "spam" too.
There are many different purposes to spam, and a given spam message may have more than one purpose. Spam may be simple mass advertising. It may be an attempt to defraud unsuspecting victims. Spam may have malicious intent, attacking the recipient or their devices, or to use them as a jumping-off point to attack others. Spam may be used to gather intelligence as simple as "Does an email address exist?" or as a part of a highly sophisticated, targeted "advanced persistent threat" attack. There is no single simple answer to your question.
A Personal Statement about Spam:
There are those who argue that the First Amendment gives them the right to send spam. I heard these arguments especially in the early days. I strongly disagree.
I contend that the First Amendment does not give you the right to force me to react or listen to your free speech. You have the right to stand on a street corner or in a public park and say what you wish. I may choose to listen or I may choose to walk away, but you do not have a right to force me to react, listen, or prevent me from walking away.
Extending that argument, you have a right to post your free speech on your website, where I may or may not choose to read it, but you do not have the right to forcibly deliver your free speech to my email inbox or my phone, filling it with unwanted messages and forcing me to react to delete it. For the same reason, you do not have a right to call my home, forcing me to react, interrupting my family meal or taking the time to delete it from my voice mailbox. That's true whether it is a real person or an automated bot delivering a recorded message, political, charity, poll, or otherwise.
I am not a lawyer or constitutional law expert. All I have is a common sense response to nonsense "free speech" assertions.