在编码理论中，喷泉码（也称为**率抹除码）是一类抹除码，其有能力从一组给定的源符号中产生一串无限的编码符号串行，而在理想情况下，只需获得大小和源符号相同或稍大的任意编码符号子集，便可恢复源符号。术语“喷泉”或“**率”是指这样的事实：这些码不显示出固定的编码率。

如果原始k个源符号可以从任意k个编码符号中恢复，则该喷泉码是最佳的。喷泉码是高效的编解码算法，因有很大概率能从任意k’个编码符号恢复原始的k个源符号（k’仅稍大于k）而知名。

LT码是第一种实际实现的喷泉码。随后提出的Raptor码和在线码加入了输入符号的预编码阶段，实现线性时间的编解码复杂度。

In coding theory, fountain codes (also known as rateless erasure codes) are a class of erasure codes with the property that a potentially limitless sequence of encoding symbols can be generated from a given set of source symbols such that the original source symbols can ideally be recovered from any subset of the encoding symbols of size equal to or only slightly larger than the number of source symbols. The term fountain or rateless refers to the fact that these codes do not exhibit a fixed code rate.