What is the difference between variable and object in C# ?

See more:

C#

OOP

let's say that i have a Class Building

Building house = new Building();

now i was reading in a book that say that

Quote:

This declaration performs three functions. First, it declares a variable called house of the
class type Building. This variable is not, itself, an object. Instead, it is simply a variable that
can refer to an object.

and then i am came across a Answerin Stackoverflow that say's that

Quote:

his is easy to understand if you look at an example. For example, suppose you have a class House. Your own house is an object and is an instance of class House. Your sister's house is another object (another instance of class House

// Class House describes what a house is
class House {
    // ...
}

// You can use class House to create objects (instances of class House)
House myHouse = new House();
House sistersHouse = new House();

now i am confused whether it's an object or an Variable?
ps: i am new to C#

What I have tried:

read many articles but confused