Sometimes good just isn't good enough. That's exactly what Alphabet (NASDAQ: GOOG) (NASDAQ: GOOGL) investors can say after its latest results came out, as they were pretty good by most standards, yet the stock tumbled more than 7% following the report.

However, I think this represents a great buying opportunity, as investors aren't seeing the full picture of how strong Alphabet's business is.

Alphabet is better known by some brands underneath their umbrella -- Google, YouTube, and Android are all Alphabet products. But there's one key theme among its lineup: advertising.

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Source Fool.com