*Surah Introduction
The Surah explains some of the basic beliefs of Islam, especially the belief in life after death and the Akhirah.
Sections:
The truth of the Qur'an and the truth of Prophet Muhammad (saw).
Allah's messengers were sent to other people. The response of those to whom the prophets were sent and the result of their denial.
Allah's signs in nature to remind about the day of Resurrection.
The scenes of the day of Resurrection.
Reminders about death and the Day of Judgment.
This Surah takes its name after the first Ayat, Ya Sin.
There are 83 Ayat in this Surah.

*Central Theme
Theme 1: Establishing the Belief in the Resurrection.
Theme 2: The object of the discourse is to warn the Quraysh of the consequences of not believing in the Prophethood of Muhammad and of resisting and opposing it with tyranny, ridicule and mockery. The aspect of the warning is dominant and conspicuous although along with repeatedly giving the warnings, arguments also have been given for the correct understanding by the people.

Arguments have been given for three things:
(1) For Monotheism (Tawhid) from the signs of the universe and from common sense; (2) for the Hereafter from the signs of the universe, from common sense and from man’s own existence itself; and (3) for the Prophethood of the Prophet Muhammad. This was from the fact that he was facing all kinds of hardships in the preaching of his message without any selfish motive and from this that whatever he was inviting the people to was rational and reasonable, accepting which was in the people’s own interest.

On the strength of these arguments themes of reprobation, reproof and warning have been presented repeatedly in a highly forceful manner so that hearts are shaken up and those which have any capacity for accepting the truth left in them should not remain unmoved.

*Connection between the beginning and the ending of the Surah
The relationship between the beginning of the Surah and its end is clear. The beginning of the Surah speaks about Disbelievers deserving of the punishment as a result of their stubbornness, and as a result of Allah having sealed their hearts:

"Indeed the Word (of punishment) has proven true against most of them, so they will not believe." (36:7)
"Verily, We have put on their necks iron collars reaching to the chins, so that their heads are raised up." (36:8)
"And We have put a barrier before them, and a barrier behind them, and We have covered them up, so that they cannot see." (36:9)
The end of the Surah gives an example of one of these stubborn deniers (introduced generally at its beginning), upon whose heart Allah has sealed, and whose vision Allah has blinded, arguing with the Prophet SAW with regards to resurrection:
"And he puts forth for Us a parable, and forgets his own creation. He says: "Who will give life to these bones after they are rotten and have become dust." (36:78)
Allah Almighty mentions in the beginning and towards the end of the Surah how He is the life-giver.
إِنَّا نَحْنُ نُحْيِي الْمَوْتَىٰ وَنَكْتُبُ مَا قَدَّمُوا وَآثَارَهُمْ ۚ وَكُلَّ شَيْءٍ أَحْصَيْنَاهُ فِي إِمَامٍ مُّبِينٍ "Indeed, it is We who bring the dead to life and record what they have put forth and what they left behind, and all things We have enumerated in a clear register. " (36:12)
قُلْ يُحْيِيهَا الَّذِي أَنشَأَهَا أَوَّلَ مَرَّةٍ ۖ وَهُوَ بِكُلِّ خَلْقٍ عَلِيمٌ "Say, "He will give them life who produced them the first time; and He is, of all creation, Knowing." (36:79).

*Connection of the Surah to the Surah before/after it
Taking Satan as an enemy. Both Surah al-Fatir and Ya Sin emphasise the need to take Satan as an enemy:
- إِنَّ الشَّيْطَانَ لَكُمْ عَدُوٌّ فَاتَّخِذُوهُ عَدُوًّا ۚ إِنَّمَا يَدْعُو حِزْبَهُ لِيَكُونُوا مِنْ أَصْحَابِ السَّعِيرِ "Indeed, Satan is an enemy to you; so take him as an enemy. He only invites his party to be among the companions of the Blaze." (35:6)
- أَلَمْ أَعْهَدْ إِلَيْكُمْ يَا بَنِي آدَمَ أَن لَّا تَعْبُدُوا الشَّيْطَانَ ۖ إِنَّهُ لَكُمْ عَدُوٌّ مُّبِينٌ "Did I not enjoin upon you, O children of Adam, that you not ta'badu [enslave/serve] Satan - [for] indeed, he is to you a clear enemy." (36:60)

*The Virtues of the Surah
Jundub ibn Abdullah narrates that the Messenger of Allah said, "مَن قرَأ يس في ليلةٍ ابتغاءَ وجهِ اللهِ غُفِر له" "Whoever recites Surah Ya Sin in the night seeking the pleasure of Allah will be forgiven." [Saheeh ibn Hibban no. 2574]
Imam Ahmad has narrated in his Musnad from Safwan that, ‘The scholars use to say that when it is recited by the deceased, Allah creates ease for him/her.’ (See Tafsir ibn Kathir vol.3 pg.571)
There are a number of reports which state Surah Ya Sin is the 'Heart of the Qur'an'.