Eclecticism is combining many unrelated items to create something brand new.
Imagine creating a new kind of fruit that uses 4 or 5 different fruits, all combined on a tree while it’s growing. Yes, this is apparently a real thing. It’s called hybrid fruit and that’s how we got strawberries. Bam. Now you learned 2 things.
In psychology, eclecticism can mean using the eclectic perspective, which combines different methods and techniques, and knowledge from different fields of psychology to make a specific plan for a patient.