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Generics ↔ generic (algebraic) placeholder to work with any variety of Types, but allow Type Inference to catch specific Type

Source: www.typescriptlang.org/docs/handbook/2/generics.html

Generics in other Programming Language = JS Syntax for creating reusable components that can work with variety of Types

Regular function exist at Dynamic Level & are factory for Values with Parameter representing Values 

const valueFactory = (x: number) => x
const myValue = valueFactory(123)
**Parameterized types** are factory for [<span data-tooltip-id='preview__ygphzmh7qYAjMwdE2'>Type</span>](type)s with [<span data-tooltip-id='preview__oJpWA75QTKnSAduZp'>Param</span>](parameter) to rep [<span data-tooltip-id='preview__ygphzmh7qYAjMwdE2'>Type</span>](type)stsxtype TypeFactory<X> = Xtype MyType = TypeFactory<string>
interface ValueContainer<Value\> {
  value: Value
}
type StringContainer = ValueContainer<string\>

Type Variable​

One or more Type Variable introduced via Angle Bracket Notation

Generic Type​

factory for Types, defined using Angle Bracket Notation, to annotate with Generic Type Placeholder for TSC to infer & fill in

Generic Type Parameter​

(convention to use) single uppercase character for Generic Type Parameter

Generic Type Variable​

special Variable that works on Types instead of Values

References​