In string theory, the fundamental constituents of matter and physical interactions are not thought of as point-like particles as in conventional particle physics, but rather as one-dimensional objects called strings. Vibrations and interactions of these strings give rise to the various elementary particles and forces observed in the universe.
Branes, in this context, can be imagined as higher-dimensional generalizations of strings. Where strings are thought of as one-dimensional, branes can exist as two-dimensional surfaces (membranes), three-dimensional volumes (3-branes), and so on. Superchords refer specifically to specific types of interactions and configurations involving three-branes and higher-dimensional branes.
The behavior and interactions of superchords, along with the other branes in string theory, play a vital role in the fundamental structure of space-time and in describing physical phenomena on different scales. However, superstrings and superchords themselves are mathematical concepts still under theoretical investigation and remain topics of active research in theoretical physics.