] maintains expr in an unevaluated form.
Hold has attribute HoldAll, and performs no operation on its arguments.
Hold is removed by ReleaseHold.
, ... ] maintains a sequence of unevaluated expressions to which a function can be applied using Apply.
Even though expr itself is not evaluated, Hold[
] may still evaluate if expr is of the form f
], and upvalues for f have been defined.
See the Mathematica book: Section 2.5.5.
See also: HoldPattern, HoldForm, HoldComplete, Unevaluated, HoldAll, Symbol.
If you are in the form of an expression before it is evaluated, wrap Hold around the expression.
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