Prekambriyen, or the Precambrian, is the earliest geological time period in Earth's history, spanning from the formation of the planet about 4.6 billion years ago to around 541 million years ago. This vast era is divided into three eons: Hadean, Archean, and Proterozoic. During this time, the Earth underwent significant changes, including the formation of the first continents and oceans. Life during the Prekambriyen was primarily simple and microscopic, with the earliest organisms being prokaryotes like bacteria. Over time, more complex life forms, such as eukaryotes, began to emerge. The end of the Prekambriyen set the stage for the Cambrian Explosion, a period marked by a rapid increase in the diversity of life.