What is an escrow I have never done that before.
An escrow is someone (much) more trustworthy than any of the 2 trading partners, to which you
both have to send your funds
before receiving. When he receives both, he keeps a small fee for his service and completes the requested trade.
If one of the trade partners intends to scam, he will never get the money because he doesn't have the advantage of sending last. If he does not hold up his part of the deal, the escrower refunds who sent, after a while.