Explain Sections is MVC?

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Section are the part of HTML which is to be rendered in layout page. In Layout page we will use the below syntax for rendering the HTML –
@RenderSection("TestSection")
And in child pages we are defining these sections as shown below –
@section TestSection{
<h1>Test Content</h1> 
}
If any child page does not have this section defined then error will be thrown so to avoid that we can render the HTML like this –
@RenderSection("TestSection", required: false)

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