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Amendment IV: Protection from unreasonable searches
In plain English
Police generally need a warrant, based on probable cause and describing exactly what they're looking for, to search you, your home or your belongings.
Original text
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
Plain-English summaries are simplified for learning. Courts interpret these words in detail; this is general information, not legal advice.
Source: National Archives