Integrity constraints are used to ensure ACCURACY and consistency of data in a relational database. Data integrity allows to define certain data quality requirements that the data in the database needs to meet. If a user tries to insert data that doesn’t meet these requirements, the RDBMS will not allow so.
A constraint is a property assigned to a column or the set of columns in a table that prevents certain TYPES of INCONSISTENT data values from being placed in the column(s). Constraints are used to enforce the data integrity. This ensures the accuracy and RELIABILITY of the data in the database.

Integrity constraints are used to ensure accuracy and consistency of data in a relational database. Data integrity allows to define certain data quality requirements that the data in the database needs to meet. If a user tries to insert data that doesn’t meet these requirements, the RDBMS will not allow so.
A constraint is a property assigned to a column or the set of columns in a table that prevents certain types of inconsistent data values from being placed in the column(s). Constraints are used to enforce the data integrity. This ensures the accuracy and reliability of the data in the database.