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Concurrency is the property of the server to handle multiple simultaneous requests or tasks (parallel). This means that the server can work on several operations at the same time, without waiting for each operation to complete before the next one begins.
Concurrency improves server bandwidth, which is especially useful in heavy load environments. To achieve concurrency, various techniques can be used, such as multithreading, process branches, or event-based architectures.
An example of concurrency
Let's say you run an online store and you have a web server that handles requests from customers. Let's imagine that several users open your site and place an order at the same time. Without concurrency, the server processes requests sequentially: it accepts the request from the first client, processes it, and then proceeds to the next. If one request takes a long time (such as downloading a lot of data), other customers will wait to receive a response.
However, using concuracy, the server can process several requests at the same time. For example, when one customer makes a request to view items, another customer may make a search request. The server can execute both requests simultaneously, providing a quick response to both.
In this way, this technique helps to increase server performance and improve the user experience, ensuring fast processing of requests even in conditions of heavy load. But keep in mind that implementing this technique takes time and resources.
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