What will the following expression evaluate to: "8" + "6"?

The expression "8" + "6" evaluates to "86" because it is performing string concatenation rather than numerical addition. In JavaScript, when you use the plus operator (+) with strings, it combines the two strings into a single string. Since both "8" and "6" are enclosed in quotes, they are treated as string values. As a result, when these two strings are joined together, the output is "86".

It’s important to note that if the numbers were not in quotes, JavaScript would treat them as integers and perform addition, resulting in 14. However, since they are strings, concatenation takes precedence, leading to the result "86". This concept is critical in understanding how JavaScript handles operations involving different data types, particularly strings and numbers.