In simple, everyday language, a "latch" refers to a simple mechanical mechanism used to keep a door, gate, or box lid closed without needing a key. When you push a door shut and hear it click, that is the latch engaging with the doorframe to keep it from swinging open. In a different context, when talking about babies, a "latch" means how a baby grips and attaches to the mother's breast during feeding. In computer technology, a latch is a tiny electronic circuit that remembers and holds a piece of digital information. Across all these uses, a latch fundamentally means securing, holding, or fastening something in place temporarily.
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