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RxJava is all about two key components:

#Observable and #Observer.

In addition to these, there are other things like,

#Schedulers, #Operators and #Subscription.

Observable:

Observable is a data stream that do some work and emits data.

Observer:

Observer is the counter part of Observable. It receives the data emitted by Observable.

Subscription:

The bonding between Observable and Observer is called as Subscription. There can be multiple Observers subscribed to a single Observable.

Operator / Transformation:

Operators modifies the data emitted by Observable before an observer receives them.

Schedulers:

Schedulers decides the thread on which Observable should emit the data and on which Observer should receives the data i.e background thread, main thread etc.,