hey,
the basic difference between bachelors and diploma course is that bachelors degree is considered as high level qualification than that of diploma as bachelors degree can be pursued after completing 10+2 while diploma can be done after completing 10th examination , usually a bachelors degree is of 3 years and diploma too , after getting diploma you can take lateral entry in the respective course you have done diploma in .
i hope this helps
good luck!
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