Cisco’s Application Policy Infrastructure Controller (APIC) is a centralised software that helps you manage and configure Cisco ACI fabrics. You can download it free of charge from Cisco’s website.
Read more related to Cisco ACI: Cisco aci apic ordering guideThe APIC provides a single point of control and management for ACI fabrics. It helps you configure and manage fabric policies, monitor fabric health and performance, and troubleshoot problems. The APIC also provides an application programming interface (API) that lets you automate ACI fabric management tasks.
The APIC software is a critical component of Cisco ACI, and it is recommended that you download and install the latest version from Cisco’s website.