Article.....

I think

Bread is baked in an oven (this is similar to saying 'any oven will suffice to bake bread)

Bread is baked in the oven (=The thing that we use to bake bread is called the oven)


Sometimes there is very little difference in meaning.

I think they have close meanings. The difference here is the difference of the article "an" and "the".

"an" is an indefinite article. "the" is a definite article.

If the oven is mentioned for the first time and represents no particular oven, you use "an" :

"Bread is baked in an oven" likely mean "Bread is baked in a device called oven" or "Bread must be baked in a dev

qq_aa_zzWhich of the following is correct?

A. Bread is baked in oven.

or

B. Bread is baked in an oven.

Only B is correct. oven is a singular concrete noun so it requires an article.

CJ

It is B and is easy to understand because you have to use an because the first letter of oven is a vowel so it had to be "an" and A just sounds and is wrong.