Extra dimensions refer to spatial dimensions beyond the conventional three dimensions of height, width, and depth that we experience in our everyday lives. The concept often arises in various branches of theoretical physics, particularly in string theory and some models of cosmology, where additional dimensions are proposed to explain certain physical phenomena or to unify fundamental forces. ### Key Concepts of Extra Dimensions: 1. **String Theory**: In string theory, fundamental particles are not point-like objects but rather tiny, vibrating strings.
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