MTProto vs. Bot API
===================

Pyrogram is a framework that acts as a fully-fledged Telegram client based on MTProto, and this very feature makes it
already superior to, what is usually called, the official Bot API, in many respects. This page will therefore show you
why Pyrogram might be a better choice for your project by comparing the two APIs, but first, let's make it clear what
actually is the MTProto and the Bot API.

.. contents:: Contents
    :backlinks: none
    :depth: 1
    :local:

-----

What is the MTProto API?
------------------------

`MTProto`_, took alone, is the name of the custom-made, open and encrypted communication protocol created by Telegram
itself --- it's the only protocol used to exchange information between a client and the actual Telegram servers.

The MTProto **API** on the other hand, is what people, for convenience, call the main Telegram API as a whole. This API
is able to authorize both users and bots and is built on top of the MTProto encryption protocol by means of
`binary data serialized`_ in a specific way, as described by the `TL language`_, and delivered using UDP, TCP or even
HTTP as transport-layer protocol.

.. _MTProto: https://core.telegram.org/mtproto
.. _binary data serialized: https://core.telegram.org/mtproto/serialize
.. _TL language: https://core.telegram.org/mtproto/TL

What is the Bot API?
--------------------

The `Bot API`_ is an HTTP(S) interface for building normal bots using a sub-set of the main MTProto API. Bots are special
accounts that are authorized via tokens instead of phone numbers. The Bot API is built yet again on top of the main
Telegram API, but runs on an intermediate server application that in turn communicates with the actual Telegram servers
using MTProto.

.. figure:: https://i.imgur.com/WvwBoZo.png
    :align: center

.. _Bot API: https://core.telegram.org/bots/api

Advantages of the MTProto API
-----------------------------

Here is a list of all the advantages in using MTProto-based libraries -- such as Pyrogram -- instead of the official
HTTP Bot API. Using Pyrogram you can:

.. hlist::
    :columns: 1

    - :guilabel:`+` **Authorize both user and bot identities**
    - :guilabel:`--` The Bot API only allows bot accounts

.. hlist::
    :columns: 1

    - :guilabel:`+` **Upload & download any file, up to 2000 MiB each (~2 GB)**
    - :guilabel:`--` The Bot API allows uploads and downloads of files only up to 50 MB / 20 MB in size (respectively).

.. hlist::
    :columns: 1

    - :guilabel:`+` **Has less overhead due to direct connections to Telegram**
    - :guilabel:`--` The Bot API uses an intermediate server to handle HTTP requests before they are sent to the actual
      Telegram servers.

.. hlist::
    :columns: 1

    - :guilabel:`+` **Run multiple sessions at once, up to 10 per account (either bot or user)**
    - :guilabel:`--` The Bot API intermediate server will terminate any other session in case you try to use the same
      bot again in a parallel connection.

.. hlist::
    :columns: 1

    - :guilabel:`+` **Has much more detailed types and powerful methods**
    - :guilabel:`--` The Bot API types often miss some useful information about Telegram entities and some of the
      methods are limited as well.

.. hlist::
    :columns: 1

    - :guilabel:`+` **Obtain information about any message existing in a chat using their ids**
    - :guilabel:`--` The Bot API simply doesn't support this

.. hlist::
    :columns: 1

    - :guilabel:`+` **Retrieve the whole chat members list of either public or private chats**
    - :guilabel:`--` The Bot API simply doesn't support this

.. hlist::
    :columns: 1

    - :guilabel:`+` **Receive extra updates, such as the one about a user name change**
    - :guilabel:`--` The Bot API simply doesn't support this

.. hlist::
    :columns: 1

    - :guilabel:`+` **Has more meaningful errors in case something went wrong**
    - :guilabel:`--` The Bot API reports less detailed errors

.. hlist::
    :columns: 1

    - :guilabel:`+` **Get API version updates, and thus new features, sooner**
    - :guilabel:`--` The Bot API is simply slower in implementing new features