WhatsApp Detailed Design

Detailed design

The high-level design discussed in the previous lesson does not answer the following questions.

• How is a communication channel created between clients and servers?

• How can the high-level design be scaled to support billions of users?

• How the user’s data is stored?

• How is the receiver identified to whom the message is delivered?

To answer all these questions and similar other questions, let’s dive deep into the high-level design and explore each component in detail. Let’s start with how users make connections with the chat servers.