It means that they can be represented by real numbers or lengths along the number line. It means that the graph of the quadratic crosses (meets) the horizontal axis.
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If the discriminant of the quadratic equation is zero then it will have 2 equal roots. If the discriminant of the quadratic equation is greater than zero then it will have 2 different roots. If the discriminant of the quadratic equation is less than zero then it will have no roots.
Quadratics can two, one or no real roots.
If the discriminant of b2-4ac in the quadratic equation formula is less than zero then the equation will have no real roots.
That depends on the value of its discriminant if its less than zero then it has no real roots.
If the discriminant of a quadratic equation is 0 then it has two equal real roots.