Biodiversity is a measure of the amount of variation of lifeforms within a given area.
For example, something like the huge polytunnels growing strawberries in Herefordshire have a low biodiversity -- strawberry plants are about the only plant form that exists there and while there will be bacteria, fungus and some insects, the aim is to keep them in check to the levels required for life to exist and the strawberries to grow but to prevent anything that might cause a threat to the plants or the fruit.
Rainforests are the most bio-diverse areas on Earth. There is a huge variety in plant life, insect life and animal life and the high humidity makes a great place for bacteria and fungus to grow.
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