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=== Key Concepts === The Gen module introduces several key concepts for building generic servers: * `GenServer`: A behavior that provides a callback API for defining server behavior, including handling requests, managing state, and handling errors. * `start`: A function for starting a new GenServer process. * `call`: A synchronous function for sending a request message to a GenServer and waiting for a response. * `cast`: An asynchronous function for sending a non-blocking request message to a GenServer. * `handle_call`: A callback function that defines how a GenServer handles incoming synchronous requests. * `handle_cast`: A callback function that defines how a GenServer handles incoming asynchronous requests. * `handle_info`: A callback function that defines how a GenServer handles incoming non-request messages. * `init`: A callback function that initializes a GenServer's state.
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