Meaning of the word "the proof of the pudding is in the eating" in English

What does "the proof of the pudding is in the eating" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the proof of the pudding is in the eating

US /ðə pruːf əv ðə ˈpʊd.ɪŋ ɪz ɪn ðə ˈiː.tɪŋ/
UK /ðə pruːf əv ðə ˈpʊd.ɪŋ ɪz ɪn ðə ˈiː.tɪŋ/
"the proof of the pudding is in the eating" picture

Idiom

the real value or effectiveness of something can only be judged by putting it into practice or experiencing it

Example:
The new software looks great on paper, but the proof of the pudding is in the eating.
He says he can fix the engine; well, the proof of the pudding is in the eating.