Isomorphic refers to a relationship between two structures that can be mapped to each other in a way that preserves their properties. In mathematics, for example, two algebraic structures are isomorphic if there is a one-to-one correspondence between their elements that maintains the operations defined on them. This concept helps in understanding how different systems can be fundamentally the same despite appearing different. In computer science, isomorphic often describes web applications that can run both on the server and the client. This means that the same code can be executed in both environments, improving performance and user experience. Frameworks like React utilize isomorphic principles to enhance the efficiency of web applications by rendering content on the server before sending it to the client.