A filter is used in Angular 6 to help change data through the UI without changing its format.

Here are the different types of filters in Angular 6
Number Used to format numeric data as text separated with commas and also fractions.
Currency Filter A specific data value can be specified in a particular currency format and fractions.
Date Used to format dates in a string as per different date formats.
Uppercase Converts string to upper case.
Lowercase Converts string to lower case.
Filter Type Filters an array based on a particular criterion and returns a new array.
orderBy Used to sort an array as per a particular predicate expression.
JSON Converts JavaScript object into a JSON string
limitTo Returns a new array containing the specified number of elements from an existing array.
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BY Best Interview Question ON 18 Aug 2020