In C#, any opening parenthesis, bracket, brace or quote (altogether called "delimiters") can be highlighted with color or outline whenever you place the caret at the corresponding closing delimiter, and vice versa.
Highlighting matching C# braces with color:
Highlighting matching C# braces with outline:
In VB.NET, matching
Function keywords are highlighted when the caret is placed anywhere within or after
End Sub or
Should a matching delimiter/keyword be left out of scrolling view in the editor, it displays in a tooltip.
Displaying matching C# braces in a tooltip:
Displaying matching VB.NET keywords in a tooltip: