Ocelot serves as an API gateway in ASP.NET Core applications, providing a single entry point for microservices architecture. The tutorial demonstrates setting up Ocelot with configuration files to route requests from clients to backend services, including examples of routing GET and POST operations to different APIs running on separate ports. The implementation involves installing the Ocelot NuGet package, creating an ocelot.json configuration file with route definitions, and configuring the gateway in Program.cs.
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