According to the classification of enzymes ligases are one of the important class of enzymes

According to the classification of enzymes ligases are one of the important class of enzymes. Explain it by giving example.

Ligases are the class of enzymes that function in the formation of bond with ATP cleavage, e.g., Pyruvic acid and CO_{ 2 } combines to form oxaloacetic acid in the presence of enzyme pyruvate carboxylase