The Civil Services Examination is a nationwide competitive examination (https://en.m.wikipedia.org/wiki/Competitive_examination) in India (https://en.m.wikipedia.org/wiki/India) conducted by the Union Public Service Commission (https://en.m.wikipedia.org/wiki/Union_Public_Service_Commission) for recruitment to various Civil Services of the Government of India (https://en.m.wikipedia.org/wiki/Civil_Services_of_India) , including the Indian Administrative Service (https://en.m.wikipedia.org/wiki/Indian_Administrative_Service) (IAS), Indian Foreign Service (https://en.m.wikipedia.org/wiki/Indian_Foreign_Service) (IFS), and Indian Police Service (https://en.m.wikipedia.org/wiki/Indian_Police_Service) (IPS).

Hello
Civil Services means the jobs in states administration excluding military and judiciary. It includes jobs such as IAS, IPS, IRS, IFS.
UPSC Civil Services Examination(CSE) is conducted every year for recruitment of candidates to these A class services. It ia 3 stage process consisting of Prelims, Mains and Interview.
The eligibility criteria for UPSC CSE is that the candidate should have a graduation degree from any recognised university in any discipline.

Follow this link for more information on UPSC CSE
https://competition.careers360.com/articles/upsc-ias/am

Good luck