Learn in the textbookChange and Service Transition
DefinitionRelease and deployment management (リリース及び展開管理) is the process that bundles changes approved by change management into a release, builds and tests it, and then deploys it to the live environment.
ExplanationA release is a bundle of changes packaged together and sent to production, and can include a new software version or equipment being added. Deployment means actually distributing that release to the environment where it is used and putting it into operation. A patch file that fixes a defect is one example of a change that goes into a release.
AnalogyIt is like a moving company. It packs and carries your things, sets up the furniture in the new home so it is ready to use, and arranges in advance how to take items back if they cannot be moved in.
Memory hookRelease means "letting go," and deployment means "spreading out." Picture it as two verbs: let go of what you finished in-house, then spread it out to where the users are.