What is the weird text that shows up on a spam mail message?

There's usually a string of nonsensical, rambling text that appears in spam mail. What is its purpose? Certainly the idiots sending the mail wouldn't put in the effort. Just curious!What is the weird text that shows up on a spam mail message?
It's to make the email look real to spam filters. If the word Viagra only accounts for 1% of the total text instead of 10% there is a much better chance of it getting to the intended recipient.What is the weird text that shows up on a spam mail message?
It's supposed to confuse spam blockers. If the blocker thinks it's a real message it will let it through.

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