If you have a worksheet with a thousand rows of data it would be extremely difficult to see patterns and trends just from examining the raw information. Similar To Charts And Sparklines,conditional formatting provides another way to visualize data and make worksheets easier understand. Conditional formatting allows to automatically apply formatting-such as colors,icons,and data bars, to one or more cells based on the cell value. To do this, you'll need to create a conditional formatting rule. For example, a conditional formatting rule might be: If the value is less than $2000, color the cell red. By applying this rule, you'd be able to quickly see which cells contain values less than $2000. 

Excel Has Several Predefined