Left is "NOT" Gate and Right is a buffered "YES" Gate. "NOT" Gate is an one-input inverted gate(opposite) and buffered "YES" Gate is 2-"NOT" Gates. "YES" logic isn't important to the logical world, just used for basic digital funtion(buffered) and use for amperage boosters(non-buffered).
INPUT(BLUE LED) OUTPUT/RESULTS(RED LED)
NOT YES
- + -
+ - +
