Encapsulate Data: Disguise internal implementation aspects of objects, exposing only important interfaces for conversation. An SDK usually takes the form of application programming interfaces[one] in the form of on-system libraries of reusable capabilities used to interface to your particular programming language, or it could be as advanced as hardware-specific https://mylesjnoqq.bloguerosa.com/35277180/about-web-developer-online-courses-coursera