What is the difference between QQ coughing, knocking, and beeping? Sometimes I don’t know what is going on and I am confused?

The differences between QQ coughing, knocking, and beeping are: different sounds, different situations, and different times.

1. Different sounds

1. Cough sound: The sound of cough sound is "cough~cough".

2. Knocking on the door: The sound of knocking on the door is "dong dong dong".

3. Didi sound: The sound of Didi sound is "Didi! Didi!".

2. Different situations

1. Coughing sound: Coughing sound is the sound made when receiving system messages.

2. Knock on the door: The knock on the door is the sound made when a friend comes online.

3. Didi sound: The beep sound is the sound made when receiving messages from other people.

3. Different frequency

1. Coughing sound: The coughing sound is less frequent and will appear when logging in to QQ.

2. Knock on the door: The number of knocks on the door is determined by the number of friends followed.

3. Didi sound: The number of beep sounds is high. You can reduce the number of occurrences by blocking other people or group messages.