An independent or nonpartisan politician is an individual politician not affiliated to any political party. There are numerous reasons why someone may stand for office as an independent.
Some independent politicians may be associated with a political party, perhaps as former members of it, or else have views that align with it, but choose not to stand in its name, or are unable to do so because the party in question has selected another candidate. Others may belong to or support a political party at the national level but believe they should not formally represent it (and thus be subject to its policies) at another level.
In running for public office, independents sometimes choose to form a party or alliance with other independents, and may formally register their party or alliance. Even where the word "independent" is used, such alliances have much in common with a political party, especially if there is an organization which needs to approve the "independent" candidates.