Advertising is a pillar of the economy. Ad money is slowly shifting from old-fashioned mediums like print, radio, and broadcast television to digital ones, like the internet and streaming. This trend positions The Trade Desk (NASDAQ: TTD) as a big winner over the coming decades. The stock has already outperformed the market since going public, but there's plenty more upside ahead.

The Trade Desk is worth nearly $42 billion today, so it's not exactly flying under the radar anymore.

Still, the stock has enough growth opportunities to help make millionaires out of long-term investors, as long as it's part of a diversified portfolio.

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Source Fool.com