When the Switch surpasses the PS2 can it be called the best selling home console if the Switch lite isn't really a home console? Can the Switch surpasses the PS2 if we don't count the Switch lite? I'm don't know how much the lite have sold 

Sure, if you want to call the PSP a home console call it a home console. Dunno why anybody cares.

@Cobretti2
If you just add a 5PS Engine on your bike its licence free. At least where I live! And the Switch, as Hardstruck correctly stated is no high end home console, the same goes for a 5PS engine- its no V8 engine. But the Switch is (or at at least was) high end for a handheld when it released! And here again my fellow college is right, a hiden HDMI port under a plastic box does not transform your handheld into a home console, no matter how hard Nintendo wants to make you believe in it!! As someone stated, a car is no musicbox just because i can have music in my car.
@Hardstruck
An argument you and the others forgot:
Why is there a Switch Lite, a version you can ONLY use in HANDHELD mode, but no Switch TV like PSVita (PSTV) had? That would "transform" the PSVita into a home console a lot more than the Switch is now! Please think about that!

This is such a great point, you would need to subtract at least 20 million switches from the number. Also, if it's the different power profiles that mean it's both a console and handheld, would an integrated graphics card become an external one just because it had a higher power profile?

Why would one stand alone TV device, transform a stand alone portable device into a home console?
PS TV is a home console. 
PSVita is a handheld

Although I've legit had a fun giggle in this thread, Thank you Hardstuck-Platinum, I'll end by saying:

If you want to argue semantics: First find a dictionary definition.
If you want to argue meaning, actually discern the product design, intended uses and common uses.
If a device fits more than one function, ask if and why these functions/labels are mutually exclusive.

Nintendo Switch is the best selling home console, handheld console, hybrid console, AND console (for video games) of all time. Nintendo Switch is the best selling video game system of the PS4 and PS5 generations...meaning Nintendo has won every generation excluding the PS2 generations. (NES >> ???) (SNES >> Sega Genesis) (GameBoy >> PS1) (Wii/DS >> PS3) (NSW >> PS4) (NSW >> PS5)

...and, again, my point in how useless these subjective labels are lol. (And no, I do not actually believe Nintendo has "won" every generation, nor does it matter.)

I'm not familiar with exactly what it takes to connect a PS controller to a PSP. A quick google search gave me a Reddit thread that describes a combination of plugins, programs, and hardware. But in such a situation I think it can give you a nice console experience.

But we can make similar arguments for other systems one way or the other.
So if there is a line to be drawn, where would it be?

I think that's why for me it comes down to how it's packaged. The experience they are trying to sell. It's not a side quest, but an essential part of why people are buying it.

If it requires a TV, or external display, and an outlet natively... it's a console. If it can be held in your hands and played without those two things, it's a handheld. That's pretty much the gist of it.

Dear Lord... lol

Nintendo has won every single handheld gen since Gameboy. They are six for six in that department. Undisputed. Literally the Jordan of industry.

On the home-console side (consoles that require a TV to function and need a wall outlet), they are three for six. The NES, SNES and Wii won, the N64, Gamecube and Wii-U all lost... handedly.

The top five list for home-console sales.

1.) PS2

2.) PS4

3.) PS1

4.) Wii

5.) PS3

The top five list for handhelds sales.

1.) DS

2.) Switch

3.) Gameboy/Gameboy Color

4.) GBA

5.) PSP

There's a way to get a switch lite to be displayed on the TV. It's convoluted as hell but it can be done, so it also counts as a home console by your logic.