This is a system design interview question asked at companies like Amazon, Facebook, Google, Microsoft and many startups: How to design a messenger service like Whatsapp, WeChat or Facebook Messenger?
I will guide you through this interview question, give you talking points and point out the right questions to ask. A quick and easy explanation even if this is your first system design interview question.

=== The resources I mentioned in the video ===
High Scalability Blog: http://highscalability.com
Hired in Tech: https://www.hiredintech.com/courses/system-design

Music: www.bensound.com