胶水 (jiāoshuǐ) is a high-frequency, practical word used in neutral, everyday contexts. Its usage is almost always literal.
Shopping: When you go to a stationery store (文具店, wénjùdiàn), you would ask for 胶水 for general-purpose liquid glue, or more specifically a 胶棒 (jiāobàng) for a glue stick.
Education and Crafts: Teachers and parents use this word constantly when instructing children on art projects. “用胶水把图片粘上” (Yòng jiāoshuǐ bǎ túpiàn zhān shàng) - “Use glue to stick the picture on.”
Repairs: For simple home repairs, you might use 胶水 to fix a broken object. For more serious jobs, you'd likely specify a stronger type, like 万能胶 (wànnéngjiāo), or “superglue.”
Formality: The term is neutral and can be used in both formal and informal settings without any change.