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Veebiteenused, or web services, are a fundamental component of modern internet architecture. They enable distinct software applications to communicate with each other over a network, typically the internet, using standardized protocols. This communication allows different systems, regardless of their underlying programming language or operating system, to exchange data and functionality. The core idea behind web services is interoperability, making it easier for applications to integrate and collaborate.

The most common technologies used for web services include SOAP (Simple Object Access Protocol) and REST (Representational State Transfer). SOAP is a protocol that uses XML for its message format and relies on other protocols like HTTP or SMTP for transport. It is known for its strict standards and robust features like security and reliability. REST, on the other hand, is an architectural style that emphasizes simplicity and scalability. RESTful web services typically use HTTP for communication and often exchange data in formats like JSON or XML.

Web services are employed in a vast array of applications. They power the dynamic content on websites, enable mobile apps to fetch and display information, facilitate data sharing between enterprise systems, and are the backbone of cloud computing. For example, when a weather app displays current conditions, it is likely communicating with a weather service via a web service. Similarly, online payment gateways use web services to securely process transactions between a merchant's website and financial institutions. The widespread adoption of web services has significantly contributed to the interconnectedness and functionality of the digital world.