Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considering the limitations imposed by practicality, regulation, safety and cost.

Engineering is the practice of using natural science, mathematics, and the engineering design process [1] to solve problems within technology, increase efficiency and productivity, and improve systems.Modern engineering comprises many subfields which include designing and improving infrastructure, machinery, vehicles, electronics, materials, and energy systems.

工程师（英語： Engineer ）是指那些在工程专业领域的人，他们使用科学 知识来驾驭技术以解决实际问题，并以此为职业。 工程師工作者 [ 编辑 ]

在美国，"Engineer"一词也用于指操作机械引擎(Engine)的人，比如铁路Engineer是指火车司机，轮船Engineer是指轮机员，固定引擎机械师通常是负责固定引擎

在美國，"Engineer"一詞也用於指操作機械引擎(Engine)的人，比如鐵路Engineer是指火車司機，輪船Engineer是指輪機員，固定引擎機械師通常是負責固定引擎

Electrical engineering is an engineering discipline concerned with the study, design, and application of equipment, devices, and systems that use electricity, electronics, and electromagnetism.

Civil engineering is a professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including public works such as roads, bridges, canals, dams, airports, sewage systems, pipelines, structural components of buildings, and railways. [1] [2]

Various machine components used in mechanical engineering. Mechanical engineering is the study of physical machines that may involve force and movement. It is an engineering branch that combines engineering physics and mathematics principles with materials science, to design, analyze, manufacture, and maintain mechanical systems. [1]

Types of engineer include: Chartered Engineer; European Engineer; Incorporated Engineer; Professional Engineer; Royal Engineer; Lists of individual engineers by discipline include: List of aerospace engineers; List of canal engineers; List of chemical engineers; List of civil engineers; List of combat engineering corps; List of electrical engineers

An engineer is a person who works in engineering. The word engineer is derived from the Latin root ingenium , meaning "cleverness". [ 1 ] Most engineers learn their work in engineering schools.