A Practice Note discussing preparing a nonprovisional or provisional utility patent application's specification and formal drawings to enable and describe the application's claimed invention under 35 U.S.C. § 112(a) and ensure the claims are definite under 35 U.S.C. § 112(b) and given the applicant's intended meaning. Topics include statutory and USPTO specification requirements, the drafting process, general best practices, and drafting considerations for provisional applications and global filing.