What purpose unity gain buffer amplifiers serve

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Unity gain buffer amplifiers, also known as voltage followers, serve to interconnect circuit components while preventing interaction between them. They feature high input resistance and low output resistance, making them ideal for buffering signals. Cascading two low pass filters with a unity gain buffer improves performance by maintaining signal integrity and preventing loading effects. The feedback in these configurations is typically taken from the output to the inverting input of the op-amp. Understanding these principles clarifies the role of unity gain buffers in circuit design.
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urgent help needed

Can anyone tell me what purpose unity gain buffer amplifiers serve and why do you connect 2 low pass filters of same corner frequency by cascading them using one of these op amp buffers and not directly together. Also can you show me the diagram of this and where the feedbacks taken from. I am totally confused. Any help would be much appreciated
 
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Unity gain amplifers or voltage followers are used to buffer. i.e. they can be used to interconnect two parts of a circuit to keep the parts from interacting with each other.

They have a high input resistance and a low output resistance.

Regards
 
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