An invention is a novel and useful idea relating to processes, machines, manufactures, and compositions of matter. An invention may include such things as new or improved devices, systems, applications of software, circuits, chemical compounds, drugs, cell lines, antibodies, mixtures, etc.
An invention can be made when something new and useful has been conceived or developed, or when unusual, unexpected, or nonobvious results have been obtained and those unexpected results can be utilized. Many inventions can be patented. Even if an invention is not patented, it can still be useful for a business purpose.