Questions & Answers about La cola avanza despacio hoy.
In this sentence cola means queue / line (of people).
In Spanish, cola has several meanings:
- tail (of an animal)
- queue / line (of people waiting)
- in some contexts, train of a dress, etc.
In Spain, using hacer cola (to queue) and la cola (the queue) is very common and perfectly standard. You can also hear fila for line, but cola is probably the most usual everyday word for a queue of people.
Cola is a feminine noun, so it takes the feminine article la. That is why we say la cola, una cola, esta cola, etc.
As a general pattern, many nouns ending in -a are feminine, and cola follows that pattern. In its common meanings (tail, line/queue), cola is always feminine.