Diploma

Both, degree and Diploma are types of recognition conferred on a person on the successful completion of an educational course. However, there are a lot of differences between the two and they aren't interchangeable. To understand the difference between a degree and a Diploma, we first need to know what a university is, what AICTE is, and the role of the University Grants Commission (UGC) in India.
University
A university is an institution of higher education and research, which grants academic degrees for a number of courses. UGC stands for the University Grants Commission. The UGC was established in November 1956 as a statutory body of the Government of India for the coordination, determination, and maintenance of standards of university education in India. All cases pertaining to the allocation of grants-in-aid from public funds to the Central Universities and other Universities and Institutions of higher learning might be referred to the University Grants Commission.
AICTE
What UGC is to universities, the All India Council for Technical Education (AICTE) is to private institutes that impart technical education. The body works towards qualitative improvement of technical education, and towards implementation and proper maintenance of norms and standards in a technical education system.
What is a Degree?
The duration of a degree course is usually 3 to 4 years and the emphasis is on academics. For example, B.Com (H) is a 3-year degree course that teaches students subjects like accountancy, economics, and business studies; B.Tech is a 4-year degree course that teaches subjects like physics, chemistry and math, and includes the subject one plans to major in, an MBBS is a 5 and 1/2-year long degree that teaches the general aspects of medicine.
Who Confers the Degree
Only a university can confer a degree. To pursue higher education, only a degree from a UGC-approved university is accepted. AICTE-approved private institutes are affiliated to UGC-approved universities. In case a person graduates from an AICTE approved private institute affiliated to a UGC approved university, he still gets the degree of the university. Example: There are many AICTE approved private colleges under Guru Gobind Singh Indraprastha University, but after the completion of the course the student does not get a degree of the institute, he gets a degree of the university in this case, Guru Gobind Singh Indraparastha University.