B-Tree Explained | Insertion & Deletion in 4 minutes

3-Second Blueprint (English)

1. Each B-Tree node stores up to 2t−1 sorted keys and n+1 child pointers while keeping every leaf node at the exact same depth.
2. Inserting into full nodes promotes the median key upward, proactively splitting full parent nodes on the way down to preserve balance.
3. Deletions maintain minimum t−1 key occupancy via inorder predecessor or successor replacement, sibling key borrowing, or node merging.