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Siemens PLC programming, when to use bytes, when to use words, when to use double words, can't you use one, such as bytes?

According to the data length.

Bytes are 8 bits of data, such as IB0 (including I0.0~I0.7***8 bits).

16 bits of data, such as IW0 (including IB0 and ib1* *16 bits).

Double words are used for 32-bit data, such as MD 100 (including MW 100 and MW 102 * * 32 bits).