## Concat vs Merge
These two operators will used to combine two or more Observables into a single Observable.
### Concat:
Concat operator combines output of two or more Observables into a single Observable. Concat operator always maintains the sequential execution without interleaving the emissions. So the first Observables completes its emission before the second starts and so forth if there are more observables.
Let’s say we have two separate Observables that emits Male and Female users. When Concat operator is used, the both Observables will be combined and act as single Observable.
### Merge:
Merge also merges multiple Observables into a single Observable but it won’t maintain the sequential execution.