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We're thinking about the region beyond the termination shock. And the

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termination shock is a region where the supersonic solar wind go through a shock.

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You can think about a big waterfall that the solar wind goes and starts slowing

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down as it's approaching the interstellar medium.

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Now the heliopause is what separates us from the rest of the galaxy,

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the interstellar medium. So the Sun with its wind, it's curved like a bubble in

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the interstellar medium and the wind coming from the sun clashes against the

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interstellar medium and forms this boundary that we call the heliopause.