Key Difference: The key difference between both the nouns, Theme and Title is that Theme signifies main subject around which the author or the talk will be about and Title is like the name of the book or giving suffix or prefix to a person's name with honour or the position or designation of a person while using the word as verb. For example the theme of an article can be Gender, while the title of that article can be “General discrimination of the gender in the society” or “Gender bias in society or work culture”, etc.

Theme:

Theme is the subject or main idea of the talk or the article, writing or for a show, an exhibition. The theme of  any work is the main meaning or the perception conveyed through the concept.  For Example, The theme for the birthday party is cartoons, so in this the birthday party will be celebrated in cartoon styles with cartoon decorations and setting, cartoon based cake etc.

There is always a theme given to work like for a movie a theme might be Family Drama or Romance etc. Theme is also referred to as a unifying idea or dominating idea or a subject of discussion. There are various other meanings to theme like :

• recurring element or idea like for example, It was the usual, 'boy gets girl' theme.

• A composition, paper or report, like for example, She got A+ in her reports.

• To provide a theme, like for example, the restaurant is known for different theme menu it offers every month.

• Narrative theme is where theme becomes the central topic of narration.

• The collection of color scheme, sounds, artwork, etc in computing like for example, applying a certain selected theme to the layout or changing the visual or appearance of the layout in computing with the theme required.

  Origin of the word 'Theme' is from Middle English via: Old French from Latin 'Thema'. Verbs which are used with the word are themed and theming. Synonyms for theme can text, thesis, subject, idea, topic. Theme also provides with an underlying message.