Explain congruence. And also give the reason that why AAA congruence is not applicable on triangles.

Here are the answers to your questions.
Two objects are said to be congruent, if they are exact copies of each other (i.e., having same shape and same size).
Your next question is why AAA congruence is not applicable for proving congruency of triangles. This can be explained as,
Draw two triangles ABC and DEF such that AB = 10 cm, BC = 12 cm, AC = 14 cm, DE = 5 cm, EF = 6 cm and DF = 7 cm.
By measuring the angles, you can observe that ∠A = ∠D, ∠B = ∠E and ∠C = ∠F.
Still ∆ABC is not congruent to ∆DEF.
Hope you got the answers.

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Congruence means in harmony.In geometry as you are asking it is ...when two  plane or surface when kept on one another and are same then they are said to be congruent....Now ur next question AAA  congruence does not hold .It is not necessary that if the three angles of two triangles are congruent(same)...the triangles will be congruent..Draw it and see it for urself

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