This daily chart gives a good example of what a change of trend looks like. The AUD/NZD had been printing a series of lower highs and lower lows, which is indicative of a downtrend before trading up through one of the previous highs at the point noted on the chart. This is technically a trend change from a downtrend to an uptrend, but perhaps too early in the new trend to start looking for buys. After a couple of higher highs and higher lows though, the trend has shown itself to be stable and tradeable.
DailyFX provides forex news and technical analysis on the trends that influence the global currency markets.