Floating point values can be used when you need more precision for your data. If you had a ship flying across the screen and stored that data in an integer variable you are limited to whole numbers, so the ship might have a speed of 10. With a floating point variable you can use fractional numbers, meaning a speed of 10.5 would work. Floating point variables can also hold whole numbers. Here's some examples of values that could be used.
Unlike integer values when you want to use floating point data you must explicitly declare the variable, but like with an integer it's not essential to provide a default value. If you don't give your variable a value it will default to 0.0.
shipSpeed as float shipBoost as float = 50.47
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