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LMV831: Rail-to-rail information

Part Number: LMV831

Hello support.

I want to use the LMV831 operational amplifier in my circuit, but I'm having trouble finding information about the rail-to-rail.

In the web page I found this information: Rail-to-rail "In to V-, Out". 

I can't understand what "In to V-" means.

How much is the voltage level that the amplifier can't support, close to V+?

Thank you.

Best regards.