Glue code, also called binding code, is custom-written programming that connects incompatible software components.
In addition to connecting disparate software modules, glue code can be used to tie together multiple systems. If an organization runs cloud services on both Amazon and Google, for example, glue code can be written to allow workloads and data flow between the two companies’ servers. Glue code is also useful for custom shell commands, application wrappers and rapid application prototyping.
Glue code is sometimes looked upon as a necessary evil because it can easily become the weakest link for service level agreements (SLAs) and, if not managed properly, become excessively complicated spaghetti code that negatively affects performance.