Bullish and bearish represents buyers and sellers.
The intra-session high represents bulls and the intra-session low represents the bears. If the close is closer to high, then the bulls are in control. If the close is closer to the low, then the bears are in control.
A bullish candle shows that the price has increased over the set time period. For the bearish candle it shows that the price has decreased over the time period. Each fully formed candle represents the price action of a specific time period.