The strongest form of greeting is a full hug where you put your arms around the other person and hug each other. This is associated with kissing and touching, patting and smiling as well as a lot of eye contact and sometimes even crying.

Pushing or patting the other person's shoulder or back tells them that it's time to end the hug.

There are many differences in cuddling and hugging, depending on the formality of the relationship, the length of time since you've seen the other person, cultural norms and whether the scene is public or private.