How does sea control help a country during a war?

Sea control is a fundamental objective of naval forces that provides a nation with the ability to utilize the seas during wartime while preventing adversaries from doing the same. By establishing control, a country can secure several strategic advantages:1

• Maritime Commerce and Operations: It enables a nation and its allies to maintain essential maritime trade, conduct amphibious assaults, and execute other seaborne operations necessary for the war effort.1
• Protection and Denial: Sea control allows a nation to protect its own friendly shipping from enemy attacks while simultaneously denying the enemy the ability to navigate the seas safely.21
• Economic and Military Pressure: It facilitates the application of pressure on an enemy through blockade, preventing the import of vital commodities or the export of goods used to fund the war.2
• Power Projection: Control of the sea provides a platform for projecting military power inland, including the use of carrier-based aircraft, naval gunfire, and missile strikes against shore targets.23

Ultimately, sea control ensures that a nation can sustain its own communications and logistics while disrupting the enemy's capacity to prosecute the war.2