Help understanding "get" and "set"

i used to learn c++, now that get and set is really confusing...
can it be explained in a way i understand...?

and how is it useful?

In C++ you might've used getter and setter functions, like

class Foo {
  private:
    int bar;

  public:
    void setBar(int b) {
        this.bar = b;
    }

    int getBar() {
        return this.bar;
    }
}

The same goes for PHP, Java, and other lesser languages

The purpose of it is encapsulation

The data itself is always private, internal to the class, to the object

The only thing that's public is the accessors of that data

It gives you full control over the mutation of the internal state of the class. You can disallow setting it if you want, you can add some logic to the getter, whatever you need

That's kinda long, tho, so in C# it's been shortened

oh

$getsetdevolve

class Foo
{
    private int _bar;

    public int GetBar()
    {
        return _bar;
    }

    public void SetBar(int bar)
    {
        _bar = bar;
    }
}

can be shortened to

class Foo
{
    private int _bar;

    public int GetBar() => _bar;

    public void SetBar(int bar) => _bar = bar;
}

can be shortened to

class Foo
{
    private int _bar;
    public int Bar {
        get { return _bar; }
        set { _bar = value; }
    }
}

can be shortened to

class Foo
{
    private int _bar;
    public int Bar {
        get => _bar;
        set => _bar = value;
    }
}

can be shortened to

class Foo
{
    public int Bar { get; set; }
}

Here's a nice lil' breakdown

thanks for that