-길래 means "because I saw/noticed/found that..." - used when you discover a reason and react to it.
Discovered reason - 싸길래 샀어요 (I bought it because it was cheap [I discovered])
Observed situation - Reacting to something you noticed
Often unexpected - The discovery prompted your action
Based on observation/discovery - You found out something and acted
First person reaction common - Often "I did X because I saw Y"
Casual speech - More colloquial than -아/어서
It looked delicious, so I ordered it.
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