The most basic and important step during chart analysis is marking the support and resistance areas. Support and Resistance play an integral part in any successful trading strategy. So first lets look in to what is support and resistance.
Let's look in to a candlestick chart of EUR-USD.

In this chart we can see that the price is moving up.The price on 10th October was around 1.2868 and as on 17th October it is around 1.3117. So the price has moved up for about 249 pips. But the movement is not through a straight line. After 10th October the price has come down and the again went up till 11th October then again it came down and so on.The price has created a number of high's and low's before reaching the value of 1.3117.
The yellow circle you see in the chart is one such high and it is called a PEAK.
