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The proton which is having a different environment and all protons give different peaks is the non-equivalent proton whereas the proton sharing the same environment and all protons giving the same singles or peaks are the equivalent protons.

All equivalent proton produces a single signal and all the non-equivalent proton produces a separate signal for each proton.

As the signal is produced by the proton is divided into subparts like 1H atom produce multiplet due to the different environment

If a methyl group is surrounded by other methyl groups produces a doublet.

Or some produce quartet signal.

As per the molecule shown below the carbon represented by 1 produces a triplet due to methyl having three hydrogens.

Carbon is represented by two produce quartets because two hydrogens of methylene share different environments.

Carbon is represented by three produce septet due to 1 hydrogen share by 2 methyl groups.

Carbon represented by four produces doublet due to the six hydrogen.

Given Compound