TCS iON | 167,610 followers on LinkedIn. TCS iON is a strategic unit of Tata Consultancy Services focused on learning, assessments and business processes. | TCS iON is a strategic business unit of Tata Consultancy Services (TCS). TCS iON is focused on empowering people and organizations with tech-led education to transform themselves for the new world. It uses uniquely built ‘Phygital’ platforms that overlay digital technologies over physical assets.