The difference between Kernel and Userland
When used as nouns, kernel means the core, center, or essence of an object or system, whereas userland means a conceptual space outside the kernel in which a user's applications can run without the risk of damage to the operating system.
check bellow for the other definitions of Kernel and Userland
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Kernel as a noun:
The core, center, or essence of an object or system.
Examples:
"the kernel of an argument"
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Kernel as a noun (botany):
The central (usually edible) part of a nut, especially once the hard shell has been removed.
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Kernel as a noun (botany):
A single seed or grain, especially of corn or wheat.
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Kernel as a noun (botany, US):
The stone of certain fruits, such as peaches or plums.
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Kernel as a noun:
A small mass around which other matter is concreted; a nucleus; a concretion or hard lump in the flesh.
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Kernel as a noun (computing):
The central part of many computer operating systems which manages the system's resources and the communication between hardware and software components.
Examples:
"The Linux kernel is open-source."
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Kernel as a noun (computing):
The core engine of any complex software system.
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Kernel as a noun (calculus):
A function used to define an integral transform.
Examples:
"The Dirichlet kernel convolved with a function yields its Fourier series approximation."
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Kernel as a noun (mathematics):
A set of pairs of a mapping's domain which are mapped to the same value.
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Kernel as a noun (mathematics, linear algebra, functional analysis):
For a given function (especially a linear map between vector spaces), the set of elements in the domain which are mapped to zero; given f : X → Y, the set {x ∈ X : f(x) = 0}.
Examples:
"If a function is continuous then its kernel is a closed set."
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Kernel as a noun (mathematics, category theory):
For a category with zero morphisms: the equalizer of a given morphism and the zero morphism which is parallel to that given morphism.
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Kernel as a noun (mathematics, fuzzy set theory):
The set of members of a fuzzy set that are fully included (i.e., whose grade of membership is 1).
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Kernel as a noun (slang):
The human clitoris.
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Kernel as a noun (chemistry):
The nucleus and electrons of an atom excluding its valence electrons.
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Userland as a noun (computing, informal):
A conceptual space outside the kernel in which a user's applications can run without the risk of damage to the operating system.