Assuming that they do intersect but are not coincident, then Yes.
Just to make this a little simpler, since if you're asking this, you may not understand the above answer. As long as they're not parallel, e.g., like two floors in the same building are parallel and will never meet no matter how long you extend them, then they'll meet eventually, and will form a line. Coincident just means they are in exactly the same space, and therefore are essentially identical and only one plane, and so also will not intersect.
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YES. The intersection of two planes always makes a line. A line is at least two points.
A line. When two planes intersect, their intersection is a line.
The intersection of two distinct planes is a line. The set of common points in the line lies in both planes.
If there are two unique, non-parallel planes in space, they will intersect, and their intersection will be a line.
A line.