Biomarkers indicate biological processes, pathogenic processes, or responses to interventions. Categories of Alzheimer's Disease (AD) biomarkers include susceptibility/risk, diagnostic, monitoring, prognostic, predictive, response/pharmacodynamic, and safety biomarkers. The Division of Neuroscience (DN) at NIA is committed to advancing biomarker research for AD/ADRD, emphasizing open science practices and data sharing. NIA outlines research milestones to validate biomarkers and provides funding opportunities and resources for AD/ADRD biomarker development. FDA-approved products for AD/ADRD include in vitro diagnostic tests and PET tracers. CLEAR-AD, funded by NIA, aims to identify next-generation AD biomarkers and establish a precision medicine approach for multi-omics biomarker discovery and validation.