Talking with someone in a friendly, informal way.
“Two friends are chatting over coffee at an outdoor café.”
“A group of students is chatting near the entrance of the school.”
Use this word to describe two or more people talking casually in the picture, which is a very common scene detail in Task 3 — it's more natural-sounding than 'talking' and fits conversational, social scenes like cafés or parks.
Synonyms: talking, conversing, having a conversation