Subspace is a theoretical concept in physics and science fiction that refers to a dimension or space that exists alongside our familiar three-dimensional space. It is often used to explain phenomena that cannot be easily understood within the constraints of conventional physics, such as faster-than-light travel or communication. In many sci-fi narratives, subspace allows for instantaneous travel or transmission of information across vast distances. In the context of Star Trek, subspace is a crucial element for the operation of starships, enabling them to travel faster than light using warp drives. This fictional representation has popularized the term, leading to its use in various other media, where subspace serves as a means to explore new worlds or connect distant civilizations.