|An¬†operad¬†is a gadget used to describe algebraic structures in¬†symmetric monoidal categories. It is a bunch of abstract¬†operations¬†of arbitrarily many arguments, equipped with a notion of how to compose these, subject to evident¬†associativity¬†and¬†unitality¬†conditions. Operads are particularly important and useful in categories with a good notion of homotopy, where they play a key role in organizing hierarchies of higher homotopies.
A journal¬†is a¬†periodical publication¬†intended to further progress of¬†science, usually by reporting new¬†research. Most journals are highly specialized, although some of the oldest journals publish articles, reviews, editorials, short communications, letters, and¬†scientific papers¬†across a wide range of scientific fields. Journals contain articles that peer reviewed, in an attempt to ensure that articles meet the journal's standards of quality, and scientific¬†validity. Each such journal article becomes part of the permanent scientific record.
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