Handshakes are the standard greeting not only at initial introductions but also as a kind of greeting between people who already know one another. They will often greet each other with a handshake even if they haven’t been separated long. In some parts of the country, after releasing the other person’s hand, people often raise their hand and touch it to their chest as if they are placing their new acquaintance in their heart.
In Indonesia, a woman is expected to initiate a handshake. So, if you’re not sure, wait until your female counterparts extend their hands.