Question

please answer
please urgently ​

Answer 1

In 1 St photo it seems to be that they are friends who are saying hello by hugging each other and in second photo it seems to be that girl in pink is welcoming the guest and in third photo it seems to be that guy in white tshirt is delivering parcel to the guy in purple shirt and they are saying hello by polite behaviour and by shaking of hands that normally all friends do they are doing same and in fourth photo they are saying hello by bowing down and in fifth photo it seems to be that the young girl is saying hello by kissing his mother or grandmother and in last photo they are saying hello like the way all child use to say to their elders they are saying hello by a simple greeting wat known as namaste