SqlClient is a resource for database administration using Structured Query Language (SQL). SQL is a programming standard originally developed in the 1970s that is now used in many databases and related technologies. SqlClient is also a namespace designated for these resources in order to help implement SQL operations.
Techopedia explains SqlClient
A specific tool called SQuirreL SQL Client works on a Java database connectivity driver and helps users to interact with a database while also offering database-independent functions. SQuirreL SQL Client is an open-source program, and it works with other Java infrastructure.
In general, SqlClient technology will help to manipulate a database, or multiple databases, in various ways. Some SQL tools have object trees or other visual displays. They can also accommodate different changes to files with SQL elements. These resources help database managers to do more with the information stored in a particular set of tables.