The term "universe" typically refers to all of space, time, matter, and energy as a whole. It encompasses everything we can observe, including galaxies, stars, planets, and all other forms of matter and energy. The universe is incredibly vast, and its size is still not fully known or understood.
However, when you ask if there is anything bigger than the universe, it raises a philosophical and theoretical question. Some theories propose the existence of a multiverse, which would be a collection of multiple universes, each with its own physical laws and properties. According to this concept, our universe would be just one of many within a larger framework.
While the multiverse theory is intriguing, it remains speculative and is currently not supported by direct observational evidence. The nature of what lies beyond our observable universe is still an open question in cosmology, and scientists continue to explore and investigate these ideas.