What be the World Trade Center buildings used for?

i know that a undamaged bunch of financial companies lease out the building, but overall, why are the buildings call 'World Trade' and what take place within them? I know at hand are close to, 5 of them right immediately, beside Freedom Tower making the gargantuan 6th (replacement of towers 1 and 2) when it's completed. Thanks for any info!

Answers:
trading probably for stocks and such. I know closely of companies that trade stocks and brokers be surrounded by the buildings. My previous boss who is a stock broker told a few ethnic group including me roughly speaking how he have to run out of the building but closely of his friends died


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