What is ITX ？What is the difference from ATX and MATX?

ATX:
 

Introduced by Intel in 1995, the ATX motherboard totally improved computer case and motherboard design. ATX made a significant departure from the longstanding AT motherboard specification. It became the default choice for modern computer systems.

MATX:

The micro ATX (µATX, mATX, or uMTX) motherboard standard, established in December 1997, boasts dimensions of 9.6 × 9.6 inches (24.4 cm × 24.4 cm), a 20% reduction in length compared to Standard ATX. This shorter length results in fewer expansion slots, reducing from a maximum of 7 in ATX to 4 in micro

ITX:
Commonly known as Mini-ITX, this specification, proposed by VIA Technologies, emerged as the advocated standard for future miniaturized computers. The compact Mini-ITX motherboard (170×170 mm) excels in both size and power efficiency. Ideal for integration into automobiles or small audio systems, it supports the addition of extra hardware.

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