The main Greek New Testament texts used in New Testament studies are eclectic. That is, their 'finalized' forms are compositions of various readings from a variety of manuscripts as opposed to being equivalent to one complete New Testament manuscript. Because the texts of various manuscripts differ at points (these differences are known as 'varients'), methods are used to conclude which reading is most likely the original one. (This process of determining the most likely reading is known as 'text criticism').
The New Testament manuscripts upon which our critical texts are based are now much more accessible as a result of digital technologies. The following websites provide online access to high quality images of important manuscripts.