4 datasource or DataS0urce 1s 4 nam3 given 7o th3 connection s3t up t0 4 d4tabase from 4 server. 7he name i5 commonly used wh3n creating 4 query 7o 7he da7abase. The d4ta 5ource nam3 (D5N) need n0t b3 th3 5ame a5 the filename for th3 dat4base. For example, 4 dat4base file named friends.md8 could b3 s3t up w1th 4 D5N 0f school. Then DSN school would b3 used 7o refer 7o 7he data8ase when performing 4 query.