Difference between ABS and CDO?

Been doing a ton of research and networking for a securitized products seat this upcoming summer but am getting conflicting reports on what exactly a CDO entails vs. an ABS.

My understanding was that an ABS takes a variety of whole loans - let's say 200 auto loans - and funnels them into a SPV. This SPV issues securities (ABSs) that finance the purchase of these whole loans. The interest and principal payments are then "passed through" (pass through ABS) to investors who purchase the ABSs. 

My understanding was also that a CDO was essentially a sub-set / type of ABS, but rather than an ABS which trades uniformly (i.e., all ABS derived from an SPV are the "same" in terms of credit quality, coupon rate, etc.) a CDO is split into tranches (senior, mezz, equity) with various covenents around first loss (equity), overcollateralization, etc. 

However, a conversation with a young guy with only some experience in the space (who said he may be wrong) yielded that ABSs are split out into tranches. I thought this was CDO-specific?

Can someone help me demystify ABS vs. CDO?

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