Foreign stocks are underrated investments that could be an important addition to your portfolio. International companies can be a great tool for diversification, and they remove some risk from investment strategies that depend on the continued health of the U.S. economy. There's a whole world of strong businesses out there -- these are three of the best international stocks to consider.

ASML (NASDAQ: ASML) supplies manufacturing equipment to customers in the semiconductor industry. This Dutch company holds more than a 90% market share within the niche of lithography machines, which are essential in microchip fabrication. ASML's place in the supply chain means that it shares some of the long-term demand drivers with high-profile chipmakers like Nvidia, Intel, and .

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