A sequence may refer to any of the following:
1. A sequence is an ordered list containing successive steps or functions for performing certain actions. It can be used in programming or as a simple set of instructions to achieve a result, like accessing an account on a website or creating a word processing document.
2. In an SQL database, a sequence is used to generate a unique number and starting point, which is then increased based on a set interval. A sequence is often used to create a primary key value in a database table and is typically incremented by one with each newly generated number.