What kind of phenotype does a co-dominant trait produce?

A co-dominant trait produces a phenotype that is mid-way between the two parental phenotypes.  E.g., if the parents are red and white, if the gene for color is expressed co-dominantly, the offspring will be pink.

What Bre said was wrong..He talked about Incomplete Dominance,
That's where most of the people confuse.
In Co-dominance, both the alleles express their typical phenotypes and produce their phenotypes independently.
Our blood group is a good example of this.
IA and IB alleles are co-dominant, thus a person having the genotype (IA IB) expresses blood group AB.
Incomplete Dominance is another thing. In this, both the alleles fail to express their typical phenotypes. Thus, Hybrid's phenotype is intermediate of two alleles,
Ex, Snapdragon or Mirabilis jalapa.
R- Red, r- white
But Rr is not Red, instead it is pink (intermediate of the two)