Aggregator
A price aggregator is a site that combines prices from many exchanges into one average or composite price, for an overview of the whole market.
An aggregator is useful for a quick look, but its price exists on no order book: your orders always fill on one exchange, at that exchange’s price. For anything that involves an exact price, such as a level, a stop or an entry, use the chart of the exchange and market you trade.
Learn more: where to find a good price chart.