: Numerical integration or numerical addition or numerical aggregation or numerical aggregation is a large family of algorithms for calculating the numerical value of a definite integral. Adding a little more, the term numerical solution is also used in the sense of a numerical solution of a subcategory equation. The main purpose of this article is to calculate Definite Integral. The term numerical quadrature ( quadrature for short ) is almost synonymous with numerical quadrature ; Especially in the case of one-dimensional integral, the term quadratic is used instead of the number-based compound phrase. Some authors refer to a numerical compilation of more than one level as a cubicle , while others refer to a high-level integral as a quadratic. The basic problem with numerical aggregation is to find an approximate solution to the specific addition or definite integral নির্দিষ্ট \ displaystyle \ int _ {a} ^ {b} f (x) \, dx মধ্যে within a given range . If the f (x) function obtained in a small number of integrations is a simple function and the domain of the integration is limited, many solutions to the integral can be found.