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Milk jargon

Homogenised describes a process where the milk fat globules are reduced in size, so they remain suspended throughout the milk. This prevents the cream from separating out and gives the milk a more uniform texture.

Unhomogenised milk will have a creamy layer on top. Practically all milk in New Zealand is homogenised.
Pasteurised milk has been heat-treated to kill bugs and prevent spoilage.
Long-life or UHT is milk that's been heated to a very high temperature to destroy any bacteria. It's then packed in sterile packaging and will keep for many months without refrigeration. Once opened, it needs to be kept in the fridge and used like regular milk.
Organic milk comes from organically farmed animals. It has the same nutrition profile as its non-organic equivalent and is pesticide-free.
Biodynamic means it's sourced from biodynamic farms. This is similar to organic farming but has additional requirements for enhancing the soil's structure and nutrient cycles.