WordPress supports several different kinds of users with different levels of privilege.

Permission Admin Editor Author Contributor
Create & Edit Posts Y Y Y Y
Delete Own Posts Y Y Y Y
Publish Own Posts Y Y Y
Delete Own Published Posts Y Y Y
Edit Own Published Posts Y Y Y
Upload Files/Media Y Y Y
Publish Pages Y Y
Delete Pages Y Y
Edit Other’s Posts & Pages Y Y
Delete Other’s Posts and Pages Y Y
Edit Private Pages Y Y
Delete Private Pages Y Y
Manage Categories Y Y