What are Laravel Collections?
Why Interviewers Ask This
This is a classic screening question for Laravel roles. Hiring managers ask it early in interviews to gauge your baseline understanding and determine if you can communicate technical concepts clearly.
Answer
Collections are a fluent, chainable wrapper around arrays providing dozens of powerful methods for transforming, filtering, and aggregating data. Eloquent queries return collections automatically. Create a collection: collect([1, 2, 3, 4, 5]). Useful methods: filter(fn($item) => $item > 2), map(fn($item) => $item * 2), reject(fn($item) => $item % 2 === 0), sum(), avg(), max(), min(), pluck("name") (extract a column), groupBy("role"), sortBy("name"), unique("email"), chunk(10), first(), last(), contains(), each(fn($item) => ...), toArray(), toJson(). Collections are lazy-evaluated in many cases and are much more expressive than raw array functions.
Pro Tip
Back up your answer with a specific project or situation. Saying 'In my last Laravel project, I used this when...' immediately makes your answer more credible and memorable.