Global biodiversity conservation is critical in addressing the ongoing sixth mass extinction event driven by habitat loss, invasive species, and climate change. Biodiversity hotspots, identified based on irreplaceability and vulnerability, are key regions where conservation efforts can most effectively mitigate biodiversity loss. Over the past two decades, the concept of hotspots has evolved, with 35 regions now recognized for their high biodiversity value. These areas are home to a significant portion of global biodiversity and provide essential ecosystem services that sustain human life. Conservation efforts must focus on these hotspots to protect not only species but also the ecological processes and resources that support human well-being. The loss of biodiversity has severe consequences, including the disappearance of potential medical cures, loss of genetic resources for agriculture, and the degradation of ecosystems that provide essential services. Species extinction is irreversible and threatens the health and security of all life on Earth. Biodiversity also contributes to cultural, spiritual, and moral values, as well as economic and social stability. The loss of ecosystems, such as coastal wetlands and mangrove forests, exacerbates the impacts of natural disasters and disease outbreaks. Biodiversity loss also diminishes Earth's natural capital, with the economic cost of land biodiversity loss estimated to be substantial. Addressing these challenges requires targeted conservation strategies that prioritize hotspots, ensuring that limited resources are used effectively to protect the planet's rich biological diversity.Global biodiversity conservation is critical in addressing the ongoing sixth mass extinction event driven by habitat loss, invasive species, and climate change. Biodiversity hotspots, identified based on irreplaceability and vulnerability, are key regions where conservation efforts can most effectively mitigate biodiversity loss. Over the past two decades, the concept of hotspots has evolved, with 35 regions now recognized for their high biodiversity value. These areas are home to a significant portion of global biodiversity and provide essential ecosystem services that sustain human life. Conservation efforts must focus on these hotspots to protect not only species but also the ecological processes and resources that support human well-being. The loss of biodiversity has severe consequences, including the disappearance of potential medical cures, loss of genetic resources for agriculture, and the degradation of ecosystems that provide essential services. Species extinction is irreversible and threatens the health and security of all life on Earth. Biodiversity also contributes to cultural, spiritual, and moral values, as well as economic and social stability. The loss of ecosystems, such as coastal wetlands and mangrove forests, exacerbates the impacts of natural disasters and disease outbreaks. Biodiversity loss also diminishes Earth's natural capital, with the economic cost of land biodiversity loss estimated to be substantial. Addressing these challenges requires targeted conservation strategies that prioritize hotspots, ensuring that limited resources are used effectively to protect the planet's rich biological diversity.