Into how many domains are all organisms classified, and what are they?

All organisms are classified into three domains in the three-domain system of taxonomy. These domains are:

1. Bacteria: This domain includes all true bacteria, which are prokaryotic microorganisms characterized by a simple cell structure without a membrane-bound nucleus. They play essential roles in various ecological processes, including decomposition and nutrient cycling.
2. Archaea: Similar to bacteria in being prokaryotic, archaea are distinct organisms that often thrive in extreme environments, such as hot springs and salt lakes. They have unique biochemical and genetic properties that differentiate them from bacteria, including differences in their cell wall composition and RNA polymerases.
3. Eukarya: This domain encompasses all eukaryotic organisms, which have complex cells with a membrane-bound nucleus and organelles. Eukarya includes a diverse range of life forms, from single-celled organisms like yeast to multicellular organisms such as plants, animals, and fungi