Your computer’s long-term storage for files, programs, and the operating system itself.

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A block of metal fins that draws heat away from the CPU or GPU. Usually topped with a fan.

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Saves your system state to disk and shuts down. Uses zero power but, is slower to resume.

Files configured not to show up in regular file browsers. Usually system files.

The Hypertext Transfer Protocol that powers the web. More secure HTTPS is becoming the standard.

Paying a company to store your website’s files and data on a server so it’s accessible 24/7.

A digital fingerprint of some data. Used to verify that files haven’t been tampered with.

High Dynamic Range. Heightens a picture’s dynamic range (contrast) for richer, more detailed images.

A hypersurface is an n-1 dimensional submanifold in n-dimensional space. Simply put, it's a geometric structure whose dimension is one less than the surrounding space. It's the generalization of lines in a plane and planes in space to higher-dimensional spaces.

The degree of height; the distance from the ground or a reference point up to somewhere; the distance from the bottom to the top of an object.

A hexagon is a flat shape with six sides and six angles, and it's very common in everyday life. For example, a bee's honeycomb and snowflake crystals are typical regular hexagon structures, which are not only beautiful but also save materials.

A heptagon is a polygon with seven sides and seven vertices, with an interior angle sum of 900 degrees. It's a common basic shape in geometry and can be divided into convex heptagons and concave heptagons, with the most special one being the regular heptagon.

A hendecagon is a flat shape with 11 sides and 11 angles, and it’s a type of polygon.

An hour is the internationally used unit of time, and 1 hour equals 60 minutes or 3600 seconds.

In math (linear algebra and geometric transformations), a horizontal shear is a type of linear transformation that keeps the area of a shape the same but slants it horizontally. The main feature is that each point’s y-coordinate stays the same, while the x-coordinate shifts proportionally based on the y value.

The hypotenuse is a concept unique to right triangles in geometry. It refers to the side opposite the right angle and is also the longest side of the triangle.