diff --git a/entries/containerize.txt b/entries/containerize.txt
new file mode 100644
index 0000000..93fb13e
--- /dev/null
+++ b/entries/containerize.txt
@@ -0,0 +1,6 @@
+containerize
+
+To install an application within a container, as a way of redistributing it.
+This became fashionable with the appearance of Docker and has the advantage
+of the developer being able to exactly specify and reproduce the environment
+under which the code will run, thereby aiding reliability.