Is it the team is or the team are?
Both, depending on which side of the Atlantic you are writing for and what you mean.
American English treats collective nouns as singular almost without exception. The team is winning. The government has decided. The band is on tour.
British English allows either, and chooses based on whether the group is acting as a single unit or as individuals. The team is top of the league — the team as one entity. The team are arguing among themselves — the members acting separately.
That flexibility is why British newspapers write England have won while American ones write the United States has won.
Collective nouns include team, government, committee, staff, family, band, jury, company, audience, couple and police — though police is treated as plural in both varieties: the police are investigating, never is.
The rule that matters more than which you pick is consistency within a sentence. The committee has published its report and the committee have published their report are both acceptable; the committee has published their report is not, because the verb and the pronoun disagree.
Company names follow the same pattern. Apple is launching in American English, Apple are launching commonly in British.
One genuine trap regardless of variety: a phrase between the subject and verb does not change the number. The list of items is on the desk — the subject is list, not items. Long intervening phrases make this error easy, and it is one of the most common in professional writing.
None is traditionally singular but is now widely accepted as either.