What is the meaning of this sentence?

The irritable magicians make poisonous drink for the evil queen and jack.
Obviously the magicians might have been irritated and so made a plan to kill the queen and Jack by making posionous drink.

The sentence includes all letters from A to Z and so is a good practice for typing. Another sentence often practiced is- a quick brown fox jumps over the lazy dog.

The explanation that Gulshan gave is correct, a bunch of irritated magicians make a poisonous drink for the queen and her page, called Jack.

The irritable magicians make poisonous drink for the evil queen and jack.
Obviously the magicians might have been irritated and so made a plan to kill the queen and Jack by making posionous drink.

The sentence includes all letters from A to Z and so is a good practice for typing. Another sentence often practiced is- a quick brown fox jumps over the lazy dog.

Yes sir. Such sentences where all the alphabets are used are known as 'Panagrams'.

The irritable magicians make poisonous drink for the evil queen and jack.
Obviously the magicians might have been irritated and so made a plan to kill the queen and Jack by making posionous drink.

The sentence includes all letters from A to Z and so is a good practice for typing. Another sentence often practiced is- a quick brown fox jumps over the lazy dog.

Thanks @Gulshan k. Ajmani: I read this sentence in Google fonts website, I go there to find new free fonts, and there I come across this sentence, I have noticed all alphabets presence.

The irritable magicians make poisonous drink for the evil queen and jack.
Obviously the magicians might have been irritated and so made a plan to kill the queen and Jack by making posionous drink.

The sentence includes all letters from A to Z and so is a good practice for typing. Another sentence often practiced is- a quick brown fox jumps over the lazy dog.

Thanks @Gulshan k. Ajmani: I read this sentence in Google fonts website, I go there to find new free fonts, and there I come across this sentence, I have noticed all alphabets presence.

Panagrams are very commonly available and famous genres in English literature