Spam in WordPress refers to unwanted or unsolicited content such as comments, trackbacks, and pingbacks that are automatically generated by bots and are usually irrelevant to the post or website.
Usually, spam contains excessive links that direct to illegal or adult websites that may also contain malware. Spam can clog up a site’s database, slow down its loading speed, and harm its search engine rankings.
WordPress has several built-in tools to prevent and manage spam, including Akismet, a spam filtering plugin that automatically checks comments and trackbacks against a database of known spam.