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Meaning: It refers to the total value of final goods and services which all the sectors of an economy are planning to buy at a given level of income during a period of one accounting year.

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Even though AD has four components, we will assume that AD is a function of only consumption expenditure and investment expenditure, i,e.
AD = C + I

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Meaning: It refers to money value of final goods and services that all the producers are willing to supply in an economy in a given time period.

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The major portion of NI is spent on Consumption of goods and services and the balance is saved. It means, Income (Y) is either consumed or saved.
National Income (Y) = Consumption (C) + Saving (S)
Y = AS = C + S