I WONDER - Why Was The Titanic Called The Unsinkable Ship?

The Titanic, once deemed unsinkable due to its advanced design, was the largest ship of its time. It featured 16 watertight compartments, allowing it to stay afloat even if four were flooded. However, during its maiden voyage, the Titanic struck an iceberg, causing water to flood six compartments, leading to its sinking.

What is a maiden voyage?

What happened when the Titanic hit the iceberg?