Officials at customs and immigration are checking travelers for things like whether they have the right documents to be in the country, whether they're legally allowed to be there, and whether they're bringing anything illegal with them.
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All travelers must complete a CBP Declaration Form 6059B itemizing all purchased merchandise and agricultural products. Here are your options: Complete a paper form that may be obtained at the port of entry or on the flight or cruise.
Most forms ask the point of exit and entry of your flight, your flight number, what goods you may be bringing into the country (forms might list prohibited items for the respective country). Complete the Customs Declaration form while on the flight. Ask your flight attendant or traveling companions questions as needed.
All goods imported into the United States are subject to inspection by CBP. You must declare all items you purchased and are carrying with you upon return to the United States, including gifts for other people as well as items you bought for yourself.
In many airports, immigration is a mandatory process that involves speaking with an immigration officer who stamps your passport, while customs is an optional process; if you have nothing to declare, you don't need to speak with an officer.