1, The full form of ISA is Industry Standard Architecture. It’s used on Computing ,Hardware in Worldwide

Industry Standard Architecture (ISA) is a computer bus standard for IBM PC compatible computers introduced with the IBM Personal Computer to support its Intel 8088 microprocessors 8-bit external data bus and extended to 16 bits for the IBM Personal Computer Intel 80286 processor. The ISA bus was further extended for use with 32-bit processors as Extended Industry Standard Architecture (EISA).

2, The full form of ISA is Internet Security and Acceleration. It’s used on Computing ,Internet in Worldwide

Microsoft Forefront Threat Management Gateway (Forefront TMG), formerly known as Microsoft Internet Security and Acceleration Server (ISA Server), is a network security and protection solution for Microsoft Windows, described by Microsoft as “enables businesses by allowing employees to safely and productively use the Internet for business without worrying about malware and other threats”.