Here's a breakdown:

* Genomics: The study of complete sets of genes (genomes) within an organism.

* Comparative Genomics: The study that compares genomes of different species to:

* Identify similarities and differences: This helps us understand evolutionary relationships, gene function, and the development of traits.

* Discover new genes and functions: By comparing genomes, we can identify genes that are present in one species but not in another, or genes that have evolved differently.

* Gain insights into disease: Comparative genomics can help us understand the genetic basis of diseases, identify potential drug targets, and develop new therapies.

Examples of Comparative Genomics:

* Comparing the human genome to the chimpanzee genome to understand the genetic basis of human evolution.

* Comparing the genomes of different bacteria to identify antibiotic resistance genes.

* Comparing the genomes of different plant species to develop new crops with improved yields or disease resistance.

Comparative genomics is a rapidly growing field that is providing valuable insights into the evolution, function, and diversity of life on Earth.