Cellular organelles play crucial roles in maintaining integrity of eukaryotic cells and sustain life of a cell. Nucleus retains genetic material, controls gene expression and serves as the command center for cellular activities. Mitochondria are center of energy and heat production, calcium storage, lipid metabolism, hormone synthesis, ROS production and cell death regulation. Chloroplasts are responsible for photosynthesis, carbon fixation glucose production, starch storage, amino-fatty acid synthesis and regulate plant metabolism. Golgi bodies are modifying, sorting, packaging proteins and transport lipids within or outsie cell. The endoplasmic reticulum carry out proteins and lipid synthesis and detoxification. Ribosomes are essential for protein synthesis and messenger RNA translation. These organelles work in concert to ensure cellular homeostasis, growth, and adaptation. Three compatments contain genome within cell which regulate different activities i.e. nucleus, mitochondria and chloroplast. Mitogenome and plastome show a wide array of conformational, varying in size, structure, and content of nucleotides. Some organelle DNAs have even developed elaborate eccentricities, such as scrambled coding regions, non-standard genetic codes, and convoluted modes of post-transcriptional modification and editing. In this review, it is compared and contrasted the breadth of genomic complexity between mitogenome and plastome. Both genomes have independently evolved having many same characteristics. This trend is most likely because the nuclear-encoded proteins mediating these processes eventually leak from one organelle into the other, leading to a high likelihood of processes appearing in both compartments in parallel. However, the complexity and intensity of genomic additions are consistently more pronounced for mitochondrial genome than for chloroplast genome, even when they are found in both compartments. The evolutionary forces responsible for these patterns, procedures and argue that organelle DNA repair processes, mutation rates, and population genetic landscapes are all important factors leading to the observed convergence and divergence in organelle genome layout and formation.