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When we plot many curves, due to repeated colors it becomes difficult to discern that which curve belongs to which equation.

For instance, 

Plot[{n!, n^n, Exp[n], Log[n], n^100, 10^n}, {n, 0, 2},   PlotLegends
 -> "Expressions"]

If am wondering whether there is a way to differentiate the different curves by clicking on the equation and highlighting the respective curve?

thanks

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Try this:

Plot[Tooltip[{n!, n^n, Exp[n], Log[n], n^100, 10^n}], {n, 0, 2}]

Now when you hover over the plot, the tooltip (the little popup window) tells which curve the mouse is pointing at.

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You can also specify your own plot styles and for functions with large ranges consider LogPlot, e.g.

LogPlot[{n!, n^n, Exp[n], Log[n], n^100, 10^n}, {n, 0, 2}, 
 PlotStyle -> {{Red, Dashing[{0.03, 0.03}]}, Green, Blue, 
   Orange, {Purple, Dashing[{0.03, 0.03}]}, Black}, 
 PlotLegends -> "Expressions"]

enter image description here

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