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okay so weamp;#39;ll cover our subjects and observables today um here uh in angular rights in angular 1 there was no uh subjects and observables concept uh as far as I know um when in angular 2 came they introduced this observables and again observables is not a um angular feature observes basically um a feature of react JS okay we have another framework called react.js like another library and there we have this reactive programming features so this observables is one of that feature okay it is a reactive um or like a asynchronous programming feature so basically just imagine an observable like a subject as a pipeline okay so and one end you will be sending messages or like stream of messages and the other end youamp;#39;ll be receiving those messages okay so and uh um it may not be one client or like um subscriber okay we can call um the message sender as a producer and message receiver as a subscriber okay so that is the terminology and sender is always one but you can have multip