How do you remove a key-value pair from a Dictionary?

Short answer: Returns true if the key was found and removed, false otherwise.

Example code

Use the Remove(key) method: dictionary.Remove("key1");

Real-world example (ShopNest)

ShopNest caches product prices in a Dictionary<string, decimal> keyed by SKU so checkout can look up a price in O(1) instead of scanning a list.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.