The video introduces API testing, explaining web services and APIs as functions with inputs and outputs. It uses the analogy of a black box to describe how APIs work, focusing on the inputs and outputs without needing to understand the internal workings. The video demonstrates using Postman to make API calls and retrieve data in JSON format, highlighting the simplicity and power of API testing.

What is the primary function of an API in the context of web services?

• To define the inputs and outputs of a web service

• To provide a user interface for web applications

• To store data in a database

• To enhance the visual design of a website

How can APIs be described in terms of their functionality?

• As a database

• As a programming language

• As a black box

• As a user interface

What is the significance of treating an API as a black box?

• It enables testing without knowing the internal workings

• It provides access to the database schema

• It helps in understanding the programming language used

• It allows us to focus on the implementation details

In the practical example, what format is the data returned in?

• JSON

• CSV

• HTML

• XML

What does JSON format primarily consist of?

• A series of images

• A list of numbers

• A set of HTML tags

• Key-value pairs