Liner or LINER may refer to:
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Line drawing
- Eye liner, a type of makeup
- Marker pen, a porous-tip pen with its own ink source
- Multiple lining tool used in engraving
- A sable brush used by coach painters
Linings
- Acoustic liner, a noise-damping panel in an aircraft engine
- Album liner, a record sleeve or combination of sleeve and outer sheath (usually printed cardboard) in which a vinyl record is stored
- Liner notes, text printed on or accompanying the sheaths, cases and other forms of packaging in which vinyl records, CDs, DVDs, etc., are stored
- Bin liner, a protective layer fitted inside a bin
- Landfill liner, a membrane placed at the bottom of landfills
- Liner, an installation of well-drilling casing that does not extend to the surface
- Liner (sewing)
- Release liner, a paper or film used on labels and adhesive tapes to cover the adhesive until ready for use
Transportation
- Airliner, a large fixed-wing aircraft for transporting passengers and cargo
- Ocean liner, a type of passenger ship used primarily for long-distance transportation
- Cruise ship, also known as a cruise liner, a passenger ship used primarily for recreation
- Ship of the line, a type of warship used from the 17th century to the 19th century
Other uses
- Liner (baseball) or "line drive", a type of baseball stroke
- Linerboard or "liner", a type of paperboard used in making corrugated fiberboard
- Low-ionization nuclear emission-line region (LINER), a class of galactic nuclei (also used to refer to galaxies with such nuclei)
- Liner (band), a reincarnation of the British rock band Blackfoot Sue
- R-29RMU2 Layner (Liner), Russian submarine-launched missile
Liner (Software)
Liner is a software company that develops artificial intelligence tools for search, research, and writing. Its products are designed to support professional and academic workflows by integrating AI-based search with structured research and writing tools.
The company offers several products, including an AI search tool (Liner), an academic research platform (Liner Scholar), and a writing assistant (Liner Write). These tools are used to retrieve, organize, and synthesize information from external sources for tasks such as literature review, citation discovery, and professional writing.
Liner's technology is based on AI search systems that prioritize source-backed information. According to Fast Company, the company was ranked No. 2 in the Education category on its Most Innovative Companies of 2026 list. The publication noted Liner's focus on helping users find reliable information and referenced its performance in benchmark evaluations related to answer accuracy.