Intersection: Finding Common Elements

An intersection finds elements that exist in all specified sets. If an element is in set A AND in set B, it appears in the intersection. Elements that are in only one set are excluded. The intersection operation answers the question "what do these sets have in common?" This is fundamental for finding overlaps, shared characteristics, or common attributes. The mathematical notation for intersection is A ∩ B, read as "A intersect B". The intersection of sets A and B contains only elements that are in both A and B simultaneously. This is analogous to the logical AND operation: an element is in the intersection only if it is in A AND in B. The intersection is always smaller than or equal to the smallest input set. Only "javascript" appears in both the frontend and backend skill sets, so the in