Recursion in programming refers to a technique where a function calls itself to solve a problem. The main idea is to break the problem down into smaller instances of the same problem. This approach allows for solutions to be built incrementally, mirroring mathematical recursion.

In C++, the keyword to define a function isn't necessarily a specific reserved word like "class" or "struct". Instead, functions begin with their return type, such as "void" for functions that don't return any value. But it's worth noting that "void" is just one possible return type, and not strictly a keyword exclusively for function definition.

In C++, the single equals (=) is an assignment operator, meaning it assigns a value to a variable. The double equals (==) is a comparison operator, which checks for equality. A common mistake is to use a single equals sign instead of a double equals sign when trying to compare values, leading to unexpected behavior.

The C++17 standard, commonly referred to as C++17, was released in 2017. It brought several new features and improvements over the previous standards, streamlining the language and enhancing its capabilities for modern software development.

In C++, to force floating-point division when dividing two integers, you can cast one or both of the integers to a floating-point type (like float or double). By doing this, the division will result in a floating-point value, preserving any fractional part. For instance, (float)5 / 2 would result in 2.5 instead of 2.

Memory alignment requirements can cause "padding" between members of a struct, which can increase the total memory size of the struct. This is essential for data to be accessed in an optimized manner on the hardware.

In C++ exception handling, the throw keyword is used to signal the occurrence of an exception. When an error condition arises, using the throw keyword can help propagate the exception up the call stack until it's caught by an appropriate catch block.

The continue statement causes the current iteration of the loop to terminate, and the control jumps to the next iteration of the innermost loop that contains the continue. It won't affect any outer loops in the nested structure unless it's placed in the outer loop itself.

Multiple inheritance in C++ allows a derived class to inherit attributes and methods from more than one base class. This contrasts with single inheritance where a class can inherit only from one superclass. C++ supports multiple inheritance, unlike some other OO languages.

The swap function in C++ STL allows for a quick swap of elements between two containers. This operation is usually done in constant time as only the internal pointers are exchanged.