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'''Virtual Instrument Software Architecture''', commonly known as '''VISA''', is a widely used [[Input/output|I/O ]] [[Application programming interface|API]] in the Test & Measurement industry for communicating with [[Measuring instrument|instruments]] from a [[Personal computer|PC.]] VISA is an [[ Industry standard|industry standard ]] implemented by several T&M companies, such as [[ Agilent|Agilent Technologies ]] and [[ National Instruments|National Instruments. ]]
The VISA standard includes specifications for communication with resources (usually, but not always, instruments) over T&M(Test and Measurement)-specific I/O interfaces such as [[GPIB]] and [[VXI|VXI. ]] There are also some specifications for T&M-specific [[ Protocol (computing)|protocols ]] over PC-standard I/O, such as VXI-11 (over [[ TCPIP|TCP/IP ]] ) and USBTMC (over [[ USB|USB]]).
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