Answer:
The First Amendment to the United States Constitution garantees "freedom of speech" and "freedom of the press."
This amendment was one of the original ten amendments that make up the Bill of Rights and were added to the Constitution before it was even ratified by the states.
The First Amendment does protect the press from censorship, but that does not mean that the press can print whatever they wish to print. The government is able to censor the press if the press is going to publish some information that would be a threat to national security. An example of such a thing that the government would be allowed to censor would be if the press was going to print the codes to release the nuclear bombs that the U.S. government has. However, this is an extreme example and it is only in very rare cases that the government needs to utilize this power.
The major gaurantee that the press has from their protection under the First Amendment is that they can say bad things about politicians and the government in gerenal (as long as it does not fall under libel or slander), without being punished by the government for their actions.