What is the function of an AND gate?

Truth tables:

NAND

• 0, 0 --> 1
• 0, 1 --> 1
• 1, 0 --> 1
• 1, 1 --> 0

XNOR

• 0, 0 --> 1
• 0, 1 --> 0
• 1, 0 --> 0
• 1, 1 --> 1