How do interest groups differ from political parties?

What will be an ideal response?

Interest groups differ from political parties in three ways. First, they
tend to focus on a single issue or a narrow set of issues, whereas parties must present
and campaign on a platform that covers more political terrain. Second, interest groups
do not present candidates for elections. Third, because they do not need to win votes
like parties do, interest groups do not require as extensive a formal organization or
membership base. Instead, they often rely on a relatively narrow base of supporters
who provide labor and/or funding.