It's basically a warm, virtual hug β people use it to show support, care, or cheer someone up, like saying 'I'm here for you' and sending good vibes. It also pops up when you want to be friendly or comforting in chats.
It's a goofy grin with sweat, signaling an embarrassed or awkward moment, relief after a tense thing, or trying not to laugh. People use it after a funny fail, a cringey moment, or when teasingly admitting something a bit risky.
Both convey emotion without words and help soften messages.
They express different vibes: a hug is warm and supportive, while the sweat smile is playful and awkward.