When we use 'wire'library?

When we use 'wire'library ? It is only when we are using i2c modules like forexample pcf8574?

Please stop creating threads in Introductory Tutorials section.

Thread move to a more appropriate section.

The Wire library is the I2C library for an Arduino board.
If you use the I2C bus, then you use the Wire library. It is that simple.

Some libraries have already included the Wire library and they already call Wire.begin().

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