What is the main purpose of the Singleton pattern in software development?

The pattern Singleton guarantees that a class has only one instance and provides a global point of access to it. This is useful for managing resources or state centrally, such as a configuration manager, logger, or database connection.

Example in Swift:

class Logger {
    static let shared = Logger()
    private init() { }

    func log(_ message: String) {
        print(message)
    }
}

// Usage:
Logger.shared.log("Message")