In today's era communication between computing devices are inevitable. An era where diverse software application services needs to communicate between each other. APIs are the backbone of this modern digital interactions, connecting systems, applications, and services. Modern software architecture as evolved through different forms to facilitate distributed computing environment. Therefore the need for API as a communication bridge is necessary. This term can be used to describe many forms of such communication which may include: Software Libraries and frameworks APIs, Operating systems APIs, Web APIs etc. These interfaces serve as bridges, enabling communication and data exchange between disparate systems. This article aims to explore the core of APIs(web APIs in particular), their importance, and the extensive influence they wield on technology, businesses, and society as a whole. Then we will explore the various features and capabilities of Postman, shedding light on how it simplifies the complex task of working with APIs.

Understanding APIs
API which stands for Application Programming Interface is a medium or bridge in which different software applications can communicate data and information between each other on a network.
APIs structure data by employing standardized formats and protocols to organize information in a way that facilitates efficient communication between different software systems. These standardized structures includes: JSON (JavaScript Object Notation), XML (Extensible Markup Language), YAML (YAML Ain't Markup Language) etc. There are different types of APIs standards out there.
Web APIs have a broad range of applications across various industries and domains which include: E-commerce and Retail, Internet of Things (IoT), Cloud Services and Storage, Mapping and Location Services etc.
The following are some of the common of these web APIs standards:

1. SOAP APIs: Simple Object Access Protocol (SOAP) APIs use XML-based messaging protocols for communication and often provide more extensive standards for security and transactions.

2. GraphQL: This query language for APIs allows clients to request precisely the data they need, enabling more efficient data retrieval and reducing over-fetching of information.

3. RESTful APIs: Representational State Transfer (REST) APIs adhere to a set of architectural principles in client-server architecture based on using standard HTTP methods (GET, POST, PUT, DELETE) to perform operations on resources.

4. Websocket APIs: Websocket API is another modern web API development that uses JSON objects to pass data. This supports two-way communication between client apps and the server. The server can send callback messages to connected clients, making it more efficient than REST API.
   In contrast, there are even more API standards that are emerging today to facilitate different patterns of communication between web systems.

APIs testing (using postman)
In this rapidly evolving landscape of software development era, the complexity of dealing with web APIs reliability, functionality, security, and performance are becoming more complex. Therefore, the significance of robust API testing tools becomes undeniable.
Postman provides a user-friendly interface for working with APIs. Its intuitive interface and robust feature set make it an essential tool for developers involved in API design, testing, and collaboration. Postman offers unparalleled flexibility, enabling comprehensive API testing across diverse environments and protocols, streamlining testing workflows seamlessly.
The following includes the most crucial features that postman provides:

1. API Request Building: Postman simplifies the process of creating and sending HTTP requests to APIs. Developers can craft requests using a user-friendly interface easily, specifying parameters, headers, and authentication details effortlessly. Developers can even use postman as a proxy to monitor traffic behind a device. This can also be used to reverse engineer a site.

2. Environments: Environments making it easy to switch between different configurations for testing various environments configurations (e.g., development, staging, production).

3. Collections: Postman allows users to organize and group related API requests into collections and folders.

4. Variables: Postman facilitate definition of variables. Variables defined in postman can be in different scope which include; global, environment or collection scopes.

5. Automated Testing: This feature allows developers to create and run automated tests for their APIs. This ensures that APIs function as expected and helps catch errors early in the development process. This feature in particular can also be used to dynamically set certain variables in different scopes.

6. Mock Servers: This feature allows developers to simulate API responses, enabling front-end and back-end teams to work independently during the development process.
   API Documentation: Postman simplifies the generation of API documentation. Developers can create documentation directly within the tool, ensuring accurate documentation.

7. Collaboration and Version Control: Postman facilitates collaboration among team members by providing features like team workspaces and version control for APIs. It can also be used to sync configuration across different environment.

8. Integration with other tool: Postman also integrate seamlessly with different applications like Git, CI/CD pipelines, AWS API Gateway, AWS Bitbucket etc. for different use cases.

In general, API serves as communication bridge between systems in distributed computing environment. And Postman provides powerful abstraction layer over managing complex APIs making working with APIs easier.