What does a letter from ITD u/s 143(1) mean?

I have received a letter from ITD. It states it is issued u/s 143(1). Is it a notice?

hi @Paritosh_Trivedi

Intimation u/s 143(1) is not a Notice but a communication received from the income tax department. Once you file the income tax return, the income tax department does a preliminary assessment. This includes verifying arithmetical errors, any incorrect claim in the return, difference in tax calculation, verification of tax payment etc. The system sends the intimation to the registered email of the assessee.

Hope this helps!