As the name suggest, DVR shares have different voting rights compared to ordinary shares.
e.g. Tata Motors' DVR share will have only 10% voting right compared to its ordinary share.
A person having 10 DVR shares will have the same voting power as someone who has 1 ordinary share.
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Sometimes these shares have a different dividend rate.
e.g. In case of Tata Motors, the dividend for DVR has been fixed at 5 percentage points above ordinary shares.
Thus, if the company announces 1% dividend for ordinary shares, it will have to give 6% dividend to DVR shares.
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It is not necessary that DVR shares always have less voting rights.
Sometimes companies issue DVR shares with more voting rights than ordinary shares.