What is a positive correlation between two assets' returns? What is a negative correlation between two assets'

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What is a positive correlation between two assets' returns? What is a negative correlation between two assets' returns? Which correlation is better for reducing the variance of a portfolio made up of two assets?
Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...
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