Which level of taxa is the broadest classification in biological taxonomy?

In biological taxonomy, the kingdom is the broadest classification level. Taxonomic classification is hierarchical, starting from broad categories and moving towards more specific ones. The kingdom encompasses a large group of organisms that share fundamental traits. For example, in Carl Linnaeus's system, animalia and plantae represent major kingdoms containing numerous phyla. While phylum is broader than class and genus, it is narrower than kingdom, making kingdom the ultimate broad classification level in the taxonomic hierarchy. Thus, choosing kingdom reflects an understanding of how life forms are organized and categorized based on shared characteristics.