The `broadcast` method in the `python linebot.LineBotApi` class is used to send a message to multiple users at once. This method allows the Line Bot to send a message to all users who have added the bot as a friend. It requires a message object as a parameter, which can be customized with various types of content such as text, images, videos, etc. This method is convenient for sending broadcast notifications or updates to all subscribed users simultaneously.
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