The realized price distribution of UTXO (URPD) is a bar chart where at each purchase price it is indicated how much volume of BTC has been purchased.

When there are high bars together in a price range, it usually indicates a support zone for that price since a good amount of bitcoin was purchased at those prices.

When there are low bars in a price range, it indicates that if the market price reaches that area there may be volatility since there are few investors who have bought at those prices.