Economic uncertainty sent the Nasdaq Composite tumbling into a bear market last year, and the tech-heavy index is still down 30% from its high. Unfortunately, there is no telling when the stock market will rebound -- but it has always rebounded in the past, and there is no reason to think this time will be different. That means the next bull market is already on its way.

In the meantime, must-own stocks like The Trade Desk (NASDAQ: TTD) and Zscaler (NASDAQ: ZS) are trading at bargain prices. Both should benefit once the bool market returns. Here's what investors should know about these two buy-now-and-hold-forever stocks.

The Trade Desk is an ad tech company. Its demand-side platform (DSP) helps marketers plan, measure, and optimize data-driven campaigns across digital channels. At the heart of its DSP is a bid-factor-based system that improves campaign performance by enabling users to set precise targeting parameters with just a few clicks. Bid factors are unique to The Trade Desk.

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Source Fool.com