What is a naval blockade and how would it work in Strait of Hormuz?

"US-Iran Tensions Escalate as Trump Vows to Blockade Strait of Hormuz: What's at Stake?" In a shocking statement, former US President Donald Trump has announced plans to blockade the strategic Strait of Hormuz, a narrow waterway connecting the Persian Gulf to the Gulf of Oman. The implications of such a move are far-reaching, with potential disruptions to global oil supplies and a significant escalation of tensions between the US and Iran. The Strait of Hormuz is one of the world's most crucial shipping lanes, with over 20% of the world's oil passing through it. A blockade could have devastating consequences for the global economy and would likely be met with fierce resistance from Iran, raising the stakes in an already volatile region.

Donald Trump says that the US is going to start blockading the Strait of Hormuz. What does this mean in practice?