A more thorough explanation:

Definition: A warship is a type of ship that is commissioned by a nation's military and is used for military purposes. It is operated by a military command and crew and displays the nation's flag or other external marks indicating its country of origin. Warships are not subject to many of the safety and environmental regulations that apply to shipping vessels and passenger ships under international maritime laws.

• The USS Constitution is a warship commissioned by the United States Navy.
• The HMS Victory is a warship commissioned by the British Royal Navy.
• The INS Vikrant is a warship commissioned by the Indian Navy.

These examples illustrate the definition of a warship as a ship that is commissioned by a nation's military and used for military purposes. They are operated by a military command and crew and display the nation's flag or other external marks indicating its country of origin. Additionally, warships are not subject to many of the safety and environmental regulations that apply to shipping vessels and passenger ships under international maritime laws.