There are two types of azeotropes: minimum boiling azeotrope and maximum boiling azeotrope.
One is Ideal Solutions which follows the Raoult's law and the other is Non Ideal Solutions which doesn't follows the Raoult's.
Within non-ideal solutions, some solutions show positive deviation, in which the intermolecular force of attraction between the solute-solute and solvent-solvent are more stronger than solute-solvent interaction and others show negative deviation, in which the intermolecular force of attraction between the solute-solute and solvent-solvent are weaker than solute-solvent interaction.
Non ideal binary solution of two liquids showing Positive Deviation are known as Minimum Boiling Azeotrope.
For example a binary solution of ethanol and water is consider a Minimum Boiling Azeotrope and those Non Ideal solutions which show Negative Deviation are known as Maximum Boiling Azeotrope. For example a mixture of water and nitric acid is consider a Maximum Boiling Azeotrope.