To build a talent pipeline, it's essential to have a clear understanding of your hiring needs, goals, and challenges. You should also have a strategy for attracting, segmenting, and communicating with candidates. To do this, you can define ideal candidate personas and profiles, identify current and future talent gaps and opportunities, create and promote your employer value proposition and career site. Moreover, you can use multiple channels and methods to source candidates such as referrals, social media, events, job boards, etc. Additionally, you should use a CRM (candidate relationship management) system to store, organize, and track candidate data and interactions. Furthermore, it is important to segment your candidates based on their skills, interests, availability, and fit for your roles. Finally, develop and execute a candidate engagement plan that includes regular and relevant touchpoints such as newsletters, webinars, surveys etc., while measuring and optimizing your talent pipeline performance with metrics such as pipeline size, quality, diversity, conversion rates etc.