Difference Between API and Web Services | REST vs SOAP 🚀

By Bhau Automation • API Testing & Web Services Tutorial

🎯 What You Will Learn

What is an API?
What is a Web Service?
Difference between API and Web Services
REST API vs SOAP API
RESTful Web Services
Web Services Interview Questions
API Testing Basics

💡 Understanding APIs and Web Services is one of the most important concepts for Automation Testing, Selenium, REST Assured, and Software Testing interviews.

📌 What is an API?

API (Application Programming Interface) is a set of rules that allows two software applications to communicate with each other.

Examples:

Google Maps API
Paytm Payment API
Weather API
Facebook Login API

🌐 What is a Web Service?

A Web Service is a type of API that uses internet protocols such as HTTP or HTTPS to exchange data between applications.

All Web Services are APIs, but not all APIs are Web Services.

📊 API vs Web Service

Feature	API	Web Service
Communication	Can be offline or online	Uses network protocols
Protocol	Any protocol	HTTP/HTTPS
Data Exchange	Various formats	XML or JSON
Internet Required	Not Always	Yes

⚡ What is REST API?

REST (Representational State Transfer) is an architectural style used for creating lightweight and scalable web services.

REST APIs commonly use:

GET
POST
PUT
DELETE

REST API Example

GET https://api.company.com/users

POST https://api.company.com/users

🛠️ What is SOAP Web Service?

SOAP (Simple Object Access Protocol) is a protocol used for exchanging structured information using XML.

SOAP provides:

High Security
Strict Standards
XML Messaging
Enterprise-Level Reliability

SOAP Request Example

🔥 REST vs SOAP

Feature	REST	SOAP
Format	JSON	XML
Performance	Fast	Slower
Learning Curve	Easy	Complex
Security	Moderate	High

🌍 Real-World Use Cases

Automation Testing using REST Assured
Banking Applications
Payment Gateways
E-Commerce Platforms
Cloud Applications
Microservices Architecture

❓ Common Interview Questions

Q: What is the difference between API and Web Service?

A: API allows communication between applications, while Web Service is a type of API that works over a network.

Q: Is every API a Web Service?

A: No. Every Web Service is an API, but every API is not a Web Service.

Q: Which is better REST or SOAP?

A: REST is lightweight and faster, while SOAP offers higher security and reliability.

🎥 Watch Complete Video Tutorial

👉 Watch API vs Web Services Tutorial

🎓 Key Takeaways

API enables communication between applications
Web Service is a type of API
REST is lightweight and uses JSON
SOAP uses XML and provides high security
Important topic for API Testing and Automation Interviews

⚡ SEO Tip: REST API, SOAP Web Services, API Testing, REST Assured, and Web Services Interview Questions are highly searched keywords that can help rank your blog.

🚀 Created with ❤️ by Bhau Automation

Difference Between API and Web Services | REST vs SOAP Web Services Complete Guide