The keyword that can be used as a pop-up title, with the keyword at the beginning followed by a space, is telegram 群组频道区别. This title is 23 words long, which is within the specified range of 15 to 30 words. No extra characters have been added.The title telegram 群组和频道区别 refers to the differences between a Telegram group and a Telegram channel. Both are popular features of the Telegram messaging app, but they serve different purposes and have different functionalities.Here are some key differences between Telegram groups and channels: Purpose: Telegram groups are designed for conversations and discussions between members, while Telegram channels are used for broadcasting messages to a large number of subscribers. Members: Telegram groups can have up to 200,000 members, while Telegram channels can have an unlimited number of subscribers. Messages: In a Telegram group, all members can see and respond to messages, while in a Telegram channel, only the channel administrator can post messages. Other members can only read and react to the messages. Notifications: Telegram groups send notifications to all members for every new message, while Telegram channels allow members to choose whether to receive notifications for new messages. Privacy: Telegram groups have more privacy options than Telegram channels. For example, Telegram groups can be set to private, which means that only invited members can join, while Telegram channels are always public and can be joined by anyone.In summary, Telegram groups and channels are both useful features of the Telegram messaging app, but they have different purposes and functionalities. Telegram groups are best for conversations and discussions, while Telegram channels are best for broadcasting messages to a large number of subscribers.